.fondo {
  text-align: center;
  animation: cambioFondo 10s infinite;
  height: 350px;
  border-radius: 10px;
  background-size: cover;
  background-position: center;
  margin: 5px;
}
@keyframes cambioFondo {
  0% {
    background-image: url("img/pyramid-2826194_1280.jpg");
  }
  33% {
    background-image: url("img/tour-3491266_1280.jpg");
  }
  66% {
    background-image: url("img/vietnam-1139411_1280.jpg");
  }
  100% {
    background-image: url("img/photographer-407068_1280.jpg");
  }
}
.navegacion {
  padding: 20px;
  text-align: center;
}
.navegacion .menu {
  color: #22577a;
  text-decoration: none;
  font-size: 20px;
  margin: 0 20px;
  border-radius: 10px;
  transition: background 0.3s ease-in-out;
  padding: 10px 20px;
  box-shadow: 3px 3px 5px #4472ca;
}

.navegacion .menu:hover {
  background-color: #57cc99;
  font-size: 40px;
}

.titulo {
  text-align: center;
  font-size: 40px;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  text-transform: uppercase;
  color: black;
  background-color: rgba(240, 248, 255, 0.8);
  padding: 50px;
  margin: 5px;
  border-radius: 10px;
  transition: background 0.4s ease-in-out;
  text-shadow: 2px 5px 5px #8da9c4;
}
.titulo:hover {
  background-color: #168aad;
  color: white;
}

.presentacion {
  text-align: justify;
  font-size: medium;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  padding: 20px;
}
.presentacion h4 {
  text-align: center;
  font-size: medium;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  padding: 30px;
  text-transform: uppercase;
}
.caja {
  width: 300px;
  height: 300px;
  display: inline-block;
  margin: auto;
  padding: 20px;
  box-shadow: 3px 5px 5px #8da9c4;
  overflow: hidden;
  overflow-y: scroll;
  font-size: medium;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  text-align: justify;
  margin: 5px;
  border-radius: 10px;
}
.caja h3 {
  text-align: center;
  font-size: 30px;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  text-shadow: 2px 5px 3px #8da9c4;
}

div.caja.oculto img {
  display: none;
}
div.caja.oculto:hover img {
  display: block;
  width: 300px;
}

.lista {
  text-align: center;
  font-size: medium;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  border-radius: 10px;
  box-shadow: 0px 0px 10px #cad2c5;
  max-width: 450px;
  float: left;
  margin: 20px;
  background-color: #fdfffc;
  padding: 25px;
}
.a {
  text-align: center;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
    "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  text-transform: uppercase;
  font-size: 25px;
}
.ordenada {
  font-size: 1em;
  padding: 10px 6px;
  border-bottom: 1px solid #80ed99;
  text-align: justify;
  transition: all 0.5s ease-in-out;
  list-style: decimal inside;
}
ol li:hover {
  background: #007bff;
  color: white;
  cursor: pointer;
  transform: translateX(5px);
}

.tabla {
  text-align: center;
  font-size: medium;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  border-radius: 10px;
  box-shadow: 0px 0px 10px #cad2c5;
  display: flex;
  flex-direction: column;
  margin: 10px auto;
  max-width: 700px;
  background-color: #fdfffc;
  padding: 5px;
  float: left;
}
.p {
  text-align: center;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
    "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  text-transform: uppercase;
  font-size: 25px;
}
td {
  font-size: 1em;
  padding: 10px 6px;
  border-bottom: 1px solid #80ed99;
  text-align: justify;
  transition: all 0.5s ease-in-out;
  list-style: decimal inside;
}

.ultimo {
  text-align: center;
  font-size: 1.5em;
}
.imagen {
  width: 400px;
}
.img {
  display: inline-block;
  margin: 20px;
  padding: 20px;
  box-shadow: 0px 0px 10px #8da9c4;
  font-size: medium;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  text-align: justify;
}

.video {
  margin: 5px;
  margin-left: 10px;
  width: 500px;
  max-width: 600px;
  display: inline-block;
}
.fomulario {
  max-width: 600px;
}
.ultimo {
  font-size: 20px;
  font-family: cursive;
  background-color: #57cc99;
}

.formulario {
  max-width: 400px;
  margin: 20px auto;
  background: #f7f7f7;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  font-family: Arial, sans-serif;
}
.formulario label {
  font-weight: bold;
  display: block;
  margin-bottom: 5px;
}
.formulario input[type="text"],
.formulario input[type="number"],
.formulario input[type="password"] {
  width: 100%;
  padding: 8px;
  margin-bottom: 15px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}
.formulario input[type="submit"] {
  background: #0078d7;
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}
.formulario input[type="submit"]:hover {
  background: #005a9e;
}