body {
  background: url(../img/homebanner.jpg);
  background-size: cover;
}
@media only screen and (max-width:430px) {
  body {
  background: url(../img/homebannertel.jpg);
  background-size: cover;}
  }
body h1 {
  position:relative;
  color: #fff;
  text-align: center;
  font-weight: bold;
  font-family: "Roboto", sans-serif;
  line-height: 52px;
  margin-bottom: 10px; 
  margin-top: 0px; 
}
  liens {text-align: center;
  font-family: "Roboto", sans-serif;
  }
  reseau {text-align: center;}
button {background-color: lightgreen;
  scrollbar-face-color: blue;
  margin-left: 5px;
  margin-right: 5px;
  margin-top: 15px;
  border-radius: 5px;
  height: 50px;
  width: 150px;
  
}
button:hover{
    background-color: red;
}
.primary_btn {
  display: inline-block;
  background: -webkit-linear-gradient(to right, #3fcaff 0%, #a4ffb0 51%, #3fcaff 100%);
  background: -moz-linear-gradient(to right, #3fcaff 0%, #a4ffb0 51%, #3fcaff 100%);
  background: -ms-linear-gradient(to right, #3fcaff 0%, #a4ffb0 51%, #3fcaff 100%);
  background: -o-linear-gradient(to right, #3fcaff 0%, #a4ffb0 51%, #3fcaff 100%);
  background: linear-gradient(to right, #3fcaff 0%, #a4ffb0 51%, #3fcaff 100%);
  background-size: 200% auto;
  padding: 0px 35px;
  color: #222222;
  letter-spacing: 1px;
  font-family: "Roboto", sans-serif;
  font-size: 12px;
  font-weight: 500;
  line-height: 50px;
  margin: 20px;
  border-radius: 5px;
  height: 50px;
  width: 150px;
  outline: none !important;
  box-shadow: 0px 10px 30px rgba(163, 255, 177, 0.2);
  text-align: center;
  cursor: pointer;
  -webkit-transition: all 0.4s ease 0s;
  -moz-transition: all 0.4s ease 0s;
  -o-transition: all 0.4s ease 0s;
  transition: all 0.4s ease 0s;
  text-transform: uppercase; }
  .primary_btn:hover {
    background-position: right center;
    color: #22195e; }