body{
  background-color: gray;
  background-image: url("fondolink.gif");
  background-image: no-repeat;
  background-image: fixed;
  background-image: center;
}

#display{
  border-style: double;
  border-color: orange;
  text-align: center;
  color: turquoise;
  background-color: black;
  margin-left: 180px;
  margin-right: 180px;
}

.input{
  text-align: center;
}

.botones{
  text-decoration: none;
  padding: 3px;
  padding-left: 10px;
  padding-right: 10px;
  font-family: helvetica;
  font-weight: 300;
  font-size: 25px;
  font-style: italic;
  color: turquoise;
  background-color: gray;
  border-radius: 15px;
  border: 3px double orange;
}

.botones:hover{
  opacity: 0.6;
  text-decoration: none;
}

#display:hover{
  background-color: turquoise;
  color: black;
}