body {
    margin : 0;
    padding : 0;
    top : 0;
    left : 0;
    font-size: 16px;
    z-index: -1;
   }
   body::before {    
      content: "";
      background-image: url("http://escapegame.kermorvant.bzh/Favicon/fondsiteV3.jpg");
      background-size: cover;
      position: absolute;
      top: 0px;
      right: 0px;
      bottom: 0px;
      left: 0px;
      opacity: 0.45;
      z-index: -1;  
      
}
h1 {
    background-color : #000052;
    opacity: 1;
    color : #fff;
    font-size: 36px;
    text-align : center;
    margin : 0;
    padding : 1rem;
    z-index: 1
}

form {
    width : 35%;
    text-align : center;
    margin : auto;
}
.button {

  display: inline-block;

  border-radius: 12px;

  background-color: steelblue;

  border: none;

  color: #FFFFFF;

  text-align: center;

  font-size: 28px;

  padding: 20px;

  width: 200px;

  transition: all 0.5s;

  cursor: pointer;

  margin: 5px;

}


.button span {

  cursor: pointer;

  display: inline-block;

  position: relative;

  transition: 0.5s;

}


.button span:after {

  content: '\00bb';

  position: absolute;

  opacity: 0;

  top: 0;

  right: -20px;

  transition: 0.5s;

}


.button:hover span {

  padding-right: 25px;

}


.button:hover span:after {

  opacity: 1;

  right: 0;

}