diff --git a/index.php b/index.php
index 60dddbe..4b5bf25 100644
--- a/index.php
+++ b/index.php
@@ -1,168 +1,168 @@
-<?php
-header('Expires: Sun, 01 Jan 2014 00:00:00 GMT');
-header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
-header('Cache-Control: no-store, no-cache, must-revalidate');
-header('Cache-Control: post-check=0, pre-check=0', false);
-header('Pragma: no-cache');
-
-date_default_timezone_set('America/Mexico_City');
-require_once 'include/bd_pdo.php';
-$admin_password = '7ipgl3fp03l03fa7j6l8';
-?>
-<html>
-
-<head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <title>Sistema de auditoría asistencial</title>
-    <link rel="icon" href="imagenes/favicon.ico" />
-    <link rel="stylesheet" href="./css/bootstrap-ulsa.min.css">
-    <link rel="stylesheet" href="./css/indivisa.css">
-    <link rel="stylesheet" href="./css/checador.css">
-</head>
-
-<body>
-    <header class="py-4 px-4 text-white">
-        <div class="d-flex">
-            <div class="my-auto mr-auto"><img id="logo" src="./imagenes/lasalle-blanco.svg" alt="La Salle"
-                    class="img-fluid" /></div>
-            <div class="my-auto hora pr-3 text-nowrap text-left indivisa-display"><span id="hr">00</span>:<span
-                    id="min">00</span> h</div>
-            <div class="my-auto ml-4 fecha text-left"><span id="fecha">00 xxx</span><br><span id="ano"
-                    class="indivisa-display-italic">20XX</span></div>
-        </div>
-    </header>
-    <main class="d-flex flex-row justify-content-around">
-        <div id="registro" class="sub-bloque w-100">
-            <div class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
-                <img src="imagenes/registrar.svg" alt="registrar" class="align-self-end mr-4 juanita">
-                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
-                    <form class="checa-box" id="formaChecador" autocomplete="off">
-                        <div class="text-primary indivisa-text-black text-center mb-5 text-big titRegistro">Registro de
-                            asistencia</div>
-                        <div class="input-group inputChecar mx-auto">
-                            <input type="text" id="cve" placeholder="Clave de empleado" class="form-control text-center"
-                                autofocus="" autocomplete="off" maxlength="6">
-                            <div class="input-group-append">
-                                <button type="submit" id="btnChecar" class="btn btn-primary">Checar</button>
-                            </div>
-                        </div>
-                    </form>
-                </div>
-            </div>
-        </div>
-        <div id="result_ok" class="sub-bloque d-none w-100">
-            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
-                <img src="imagenes/asistencia.svg" alt="registrar" class="align-self-end mr-4 juanita">
-                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
-                    <div class="checa-box">
-                        <div class="indivisa-text-black text-center text-big mb-4">Asistencia</div>
-                        <h3 class="indivisa-text-bold subtitle text-center text-uppercase" id="nombre">Nombre</h3>
-                        <ul class="text-danger" id="list-result">
-                            <h4 class="text-secondary indivisa-text-bold  mb-3 mt-4 text-info text-uppercase">Facultad
-                            </h4>
-                            <li class="">
-                                <span class="text-secondary font-weight-bold text-uppercase mat-desc">Materia</span><br>
-                                <span class="text-secondary mat-fecha font-weight-bold">hh:mm</span>
-                                <br>
-                                <span class="text-secondary mat-salon ml-3">SALÓN: <span class="salon">SAL</span></span>
-                                <span class="text-secondary ml-3">GRUPO: <span class="mat-gpo">GPO</span></span>
-                            </li>
-                        </ul>
-                    </div>
-                </div>
-            </div>
-        </div>
-        <div id="result_no" class="sub-bloque d-none w-100">
-            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
-                <img src="imagenes/no_horario.svg" alt="no_horario" class="align-self-end mr-4 juanita">
-                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
-                    <div class="checa-box">
-                        <div class="text-center text-big indivisa-text-black text-primary my-4" id="nombre"><strong
-                                class="text-danger">No</strong> tienes clases en este horario</div>
-                        <div class="text-center sin-servicio">No hay ninguna clase registrada en este horario para
-                            <h3 id="nombre-profesor" class="indivisa-text-bold my-3"></h3>
-                            <h6 class="indivisa-text-italic mt-5"><strong class="text-danger">Recuerda:</strong> Solo se
-                                puede registrar entre <strong class="text-secondary">20</strong> minutos antes y <strong
-                                    class="text-secondary">30</strong> minutos después.</h6>
-                        </div>
-                    </div>
-                </div>
-            </div>
-        </div>
-        <div id="internet" class="sub-bloque d-none w-100">
-            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
-                <img src="imagenes/no_internet.svg" alt="no_internet" class="align-self-end mr-4 juanita">
-                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
-                    <div class="checa-box">
-                        <div class="text-big indivisa-text-black text-center">Se perdió la conexión a internet</div>
-                        <h4 class="text-secondary text-center sin-servicio my-5">Por el momento la conexión a internet
-                            está fallando, por favor inténtelo más tarde.</h4>
-                        <!-- Código de error: <span class="clave font-weight-bold">000</span> -->
-                        <div class="text-center">
-                            <div class="spinner-grow text-warning" role="status"><span class="sr-only">Loading...</span>
-                            </div>
-                            <em class="text-info">Conectando</em>
-                        </div>
-                    </div>
-                </div>
-            </div>
-        </div>
-        <div id="error_bd" class="sub-bloque d-none w-100">
-            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
-                <img src="imagenes/error.svg" alt="error" class="align-self-end mr-4 juanita">
-                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
-                    <div class="checa-box">
-                        <div class="text-big text-center indivisa-text-black text-danger mb-5">Error en el sistema</div>
-                        <h4 class="text-secondary text-center sin-servicio">Se ha presentado un error en el sistema, por
-                            favor inténtelo más tarde y repórtelo al <strong>CAS</strong>.</h4>
-                    </div>
-                </div>
-            </div>
-        </div>
-        <div id="not_in_db" class="sub-bloque d-none w-100">
-            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
-                <img src="imagenes/no_clave.svg" alt="no_clave" class="align-self-end mr-4 juanita">
-                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
-                    <div class="checa-box">
-                        <div class="indivisa-text-black subtitle mb-5 text-center text-big">La clave <strong
-                                class="text-danger" id="clave-no-encontrada"></strong> no está registrada</div>
-                        <h4 class="text-center mb-4">Revisa que la clave sea la correcta</h4>
-                        <div class="text-center indivisa-text-italic text-info">No se pudo registrar asistencia</div>
-                    </div>
-                </div>
-            </div>
-        </div>
-        <div id="avisos" class="sub-bloque d-none w-100">
-            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
-                <img src="imagenes/aviso.svg" alt="aviso" class="align-self-end mr-4 juanita">
-                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
-                    <div class="checa-box">
-                        <div class="indivisa-text-black subtitle mb-4 text-big">Avisos</div>
-                        <div class="text-secondary" id="lista-avisos"></div>
-                        <div class="text-center mt-4"><button type="button" class="btn btn-success"
-                                id="btn-aceptar-avisos">Aceptar</button></div>
-                    </div>
-                </div>
-            </div>
-        </div>
-        <p id="last-error" class="d-none">-</p>
-    </main>
-    <script>
-        var d, h, m, s, animate;
-        var started_at = new Date().getTime();
-        var server_time = <?= time(); ?>;
-        var ultimosMax = 6;
-    </script>
-    <script src="./js/jquery.min.js"></script>
-    <script src="./js/bootstrap/popper.min.js"></script>
-    <script src="./js/bootstrap/bootstrap.min.js"></script>
-    <script type="text/javascript" src="js/checador.js"></script>
-    <script>
-        $(document).ready(function () {
-            init();
-        });
-    </script>
-</body>
-
+<?php
+header('Expires: Sun, 01 Jan 2014 00:00:00 GMT');
+header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
+header('Cache-Control: no-store, no-cache, must-revalidate');
+header('Cache-Control: post-check=0, pre-check=0', false);
+header('Pragma: no-cache');
+
+date_default_timezone_set('America/Mexico_City');
+require_once 'include/bd_pdo.php';
+$admin_password = '7ipgl3fp03l03fa7j6l8';
+?>
+<html>
+
+<head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Sistema de auditoría asistencial</title>
+    <link rel="icon" href="imagenes/favicon.ico" />
+    <link rel="stylesheet" href="./css/bootstrap-ulsa.min.css">
+    <link rel="stylesheet" href="./css/indivisa.css">
+    <link rel="stylesheet" href="./css/checador.css">
+</head>
+
+<body>
+    <header class="py-4 px-4 text-white">
+        <div class="d-flex">
+            <div class="my-auto mr-auto"><img id="logo" src="./imagenes/lasalle-blanco.svg" alt="La Salle"
+                    class="img-fluid" /></div>
+            <div class="my-auto hora pr-3 text-nowrap text-left indivisa-display"><span id="hr">00</span>:<span
+                    id="min">00</span> h</div>
+            <div class="my-auto ml-4 fecha text-left"><span id="fecha">00 xxx</span><br><span id="ano"
+                    class="indivisa-display-italic">20XX</span></div>
+        </div>
+    </header>
+    <main class="d-flex flex-row justify-content-around">
+        <div id="registro" class="sub-bloque w-100">
+            <div class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
+                <img src="imagenes/registrar.svg" alt="registrar" class="align-self-end mr-4 juanita">
+                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
+                    <form class="checa-box" id="formaChecador" autocomplete="off">
+                        <div class="text-primary indivisa-text-black text-center mb-5 text-big titRegistro">Registro de
+                            asistencia</div>
+                        <div class="input-group inputChecar mx-auto">
+                            <input type="text" id="cve" placeholder="Clave de empleado" class="form-control text-center"
+                                autofocus="" autocomplete="off" maxlength="6">
+                            <div class="input-group-append">
+                                <button type="submit" id="btnChecar" class="btn btn-primary">Checar</button>
+                            </div>
+                        </div>
+                    </form>
+                </div>
+            </div>
+        </div>
+        <div id="result_ok" class="sub-bloque d-none w-100">
+            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
+                <img src="imagenes/asistencia.svg" alt="registrar" class="align-self-end mr-4 juanita">
+                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
+                    <div class="checa-box">
+                        <div class="indivisa-text-black text-center text-big mb-4">Asistencia</div>
+                        <h3 class="indivisa-text-bold subtitle text-center text-uppercase" id="nombre">Nombre</h3>
+                        <ul class="text-danger" id="list-result">
+                            <h4 class="text-secondary indivisa-text-bold  mb-3 mt-4 text-info text-uppercase">Facultad
+                            </h4>
+                            <li class="">
+                                <span class="text-secondary font-weight-bold text-uppercase mat-desc">Materia</span><br>
+                                <span class="text-secondary mat-fecha font-weight-bold">hh:mm</span>
+                                <br>
+                                <span class="text-secondary mat-salon ml-3">SALÓN: <span class="salon">SAL</span></span>
+                                <span class="text-secondary ml-3">GRUPO: <span class="mat-gpo">GPO</span></span>
+                            </li>
+                        </ul>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div id="result_no" class="sub-bloque d-none w-100">
+            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
+                <img src="imagenes/no_horario.svg" alt="no_horario" class="align-self-end mr-4 juanita">
+                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
+                    <div class="checa-box">
+                        <div class="text-center text-big indivisa-text-black text-primary my-4" id="nombre"><strong
+                                class="text-danger">No</strong> tienes clases en este horario</div>
+                        <div class="text-center sin-servicio">No hay ninguna clase registrada en este horario para
+                            <h3 id="nombre-profesor" class="indivisa-text-bold my-3"></h3>
+                            <h6 class="indivisa-text-italic mt-5"><strong class="text-danger">Recuerda:</strong> Solo se
+                                puede registrar entre <strong class="text-secondary"><?php echo $_ENV["ANTES"]; ?> </strong> minutos antes y <strong
+                                    class="text-secondary"><?php echo $_ENV["DESPUES"]; ?></strong> minutos después.</h6>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div id="internet" class="sub-bloque d-none w-100">
+            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
+                <img src="imagenes/no_internet.svg" alt="no_internet" class="align-self-end mr-4 juanita">
+                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
+                    <div class="checa-box">
+                        <div class="text-big indivisa-text-black text-center">Se perdió la conexión a internet</div>
+                        <h4 class="text-secondary text-center sin-servicio my-5">Por el momento la conexión a internet
+                            está fallando, por favor inténtelo más tarde.</h4>
+                        <!-- Código de error: <span class="clave font-weight-bold">000</span> -->
+                        <div class="text-center">
+                            <div class="spinner-grow text-warning" role="status"><span class="sr-only">Loading...</span>
+                            </div>
+                            <em class="text-info">Conectando</em>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div id="error_bd" class="sub-bloque d-none w-100">
+            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
+                <img src="imagenes/error.svg" alt="error" class="align-self-end mr-4 juanita">
+                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
+                    <div class="checa-box">
+                        <div class="text-big text-center indivisa-text-black text-danger mb-5">Error en el sistema</div>
+                        <h4 class="text-secondary text-center sin-servicio">Se ha presentado un error en el sistema, por
+                            favor inténtelo más tarde y repórtelo al <strong>CAS</strong>.</h4>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div id="not_in_db" class="sub-bloque d-none w-100">
+            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
+                <img src="imagenes/no_clave.svg" alt="no_clave" class="align-self-end mr-4 juanita">
+                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
+                    <div class="checa-box">
+                        <div class="indivisa-text-black subtitle mb-5 text-center text-big">La clave <strong
+                                class="text-danger" id="clave-no-encontrada"></strong> no está registrada</div>
+                        <h4 class="text-center mb-4">Revisa que la clave sea la correcta</h4>
+                        <div class="text-center indivisa-text-italic text-info">No se pudo registrar asistencia</div>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <div id="avisos" class="sub-bloque d-none w-100">
+            <div id="estado" class="d-flex flex-row justify-content-between align-items-start h-100 pl-3 pr-5 pt-5">
+                <img src="imagenes/aviso.svg" alt="aviso" class="align-self-end mr-4 juanita">
+                <div class="flex-grow-1 d-flex flex-row justify-content-center align-items-start">
+                    <div class="checa-box">
+                        <div class="indivisa-text-black subtitle mb-4 text-big">Avisos</div>
+                        <div class="text-secondary" id="lista-avisos"></div>
+                        <div class="text-center mt-4"><button type="button" class="btn btn-success"
+                                id="btn-aceptar-avisos">Aceptar</button></div>
+                    </div>
+                </div>
+            </div>
+        </div>
+        <p id="last-error" class="d-none">-</p>
+    </main>
+    <script>
+        var d, h, m, s, animate;
+        var started_at = new Date().getTime();
+        var server_time = <?= time(); ?>;
+        var ultimosMax = 6;
+    </script>
+    <script src="./js/jquery.min.js"></script>
+    <script src="./js/bootstrap/popper.min.js"></script>
+    <script src="./js/bootstrap/bootstrap.min.js"></script>
+    <script type="text/javascript" src="js/checador.js"></script>
+    <script>
+        $(document).ready(function () {
+            init();
+        });
+    </script>
+</body>
+
 </html>
\ No newline at end of file
