body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f5f5f5;
  margin: 20px;
}

h1, h2 {
  color: #2c3e50;
}

a {
  text-decoration: none;
  color: #2980b9;
}

a:hover {
  text-decoration: underline;
}

.contenido {
  background-color: #ebe9e9;
  padding: 20px;
  border-radius: 8px;
  max-width: 600px;
  margin: auto;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}


footer {
    background-color: #f9f7f7;
    color: rgb(3, 0, 0);
    text-align: center;
    padding: 10px;
    font-size: 0.9em;
}

/** estilo imagenes**/

div.gallery {
  border: 1px solid #ccc;
}

div.gallery:hover {
  border: 1px solid #777;
}

div.gallery img {
  width: 100%;
  height: auto;
}

div.desc {
  padding: 15px;
  text-align: center;
}

* {
  box-sizing: border-box;
}

.responsive {
  padding: 0 6px;
  float: left;
  width: 24.99999%;
}

@media only screen and (max-width: 700px) {
  .responsive {
    width: 49.99999%;
    margin: 6px 0;
  }
}

@media only screen and (max-width: 500px) {
  .responsive {
    width: 100%;
  }
}

.clearfix:after {
  content: "";
  display: table;
  clear: both;
}