body {
    background-color: #f4f4f4;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #3a3a3a;
    color: white;
    padding: 20px;
    text-align: center;
}

nav ul {
    list-style-type: none;
    background-color: #333;
    padding: 10px;
    text-align: center;
    margin: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: rgba(255, 255, 255, 0.788);
    text-decoration: none;
}



section {
    padding: 20px;
}

article {
    background-color: rgb(116, 113, 113);
    border: 1px solid #ccc;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.1);
}

footer {
    background-color: #3a3a3a;
    color: rgb(117, 115, 115);
    text-align: center;
    padding: 10px;
    font-size: 0.9em;
    margin-top: auto;
}



/* ESTILO DE LAS IMAGENES DE LA PORTADA */
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;
}