h1{
	color:white;
	font-size:30px;
font-family:Arial Black;
}

body {
background-color: #3B3B3B  ;
    text-align: center;
}

.element1{
    position: absolute;
        margin:10%;
background-color:#787878  ;
text-align:center;
margin-top: 250px;
}


nav {
  display: flex;
  justify-content: center; /* Pour centrer horizontalement */
}

nav a {
  width: 180px;
  text-decoration: none;
  color: #ffffff;
  background: #000000;
  height: 40px;
  line-height: 40px;
  padding: 20px;
  font-family: sans-serif;
  font-size: 20px;
  position: relative;
  top: 50px;
}

nav a:hover {
  background: grey;
}