/*index.css*/
#contenidor {
  background-image: url("imatges/fons.jpg");
  background-repeat: no-repeat;
  background-position: center center;
}
ul {
  position: absolute;
  display: block;
  top: 80%; 
  width: 60%;
  margin: 0 20% 0 20%;
  }
li {
  list-style-type: none;
  display: inline;
  float: left;
  text-align: center;
  width: 24%;
}
input {
  font-weight: bold;
  width: 100%;
}
#enganxina {
  border: 2px solid red;
  position: absolute;
  top:50%;
  right: 2em;
  background: yellow;
  width: 35%;
}
#enganxina p {
  margin-left: .5em;
}