#conteneur{
	width:800px;
	margin:auto;
	padding:40px;
	background-color:#F8F8FF;
	opacity:0.8;
	}
body {
  background: url("https://wallpapercave.com/wp/wp2856288.gif") no-repeat center fixed; 
  background-size: cover;
 }
	
body, html {
    height: 100%;
}

.hero-image {
  background-image: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.5)), url("https://ih1.redbubble.net/image.80797104.8934/flat,750x,075,f-pad,750x1000,f8f8f8.u1.jpg");

  height: 50%;

  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
}

.hero-text {
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
}
.button1 {
  background-color: #FFFF00;
  border: 1px solid black;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  -webkit-transition-duration: 0.4s;
  transition-duration: 0.4s;
}
.button1:hover {
  box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
  background: #3071A9
}
.button {
  background-color: #FFFF00;
  border: 1px solid black;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  -webkit-transition-duration: 0.4s;
  transition-duration: 0.4s;
}
.button:hover {
  box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
  background: #3071A9
}
.banner {
  padding: 11px 16px;
  background: #555;
  color: #f1f1f1;
  text-align: center;
}