body {
background-image: url("style/Paysage_1.jpg");
background-size: cover;  
background-position: center;
margin:auto; 
}

body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: black;
  color: #f8bc0c;
  text-align: center;
}

a:hover {
  color: #fff;
}

.title {
  text-align: center;
}

.def {
  text-align: center;
}

conteneur {
display:grid;
grid-template-columns: repeat(3, 1fr);
grid-gap: 5px;
grid-auto-rows: minmax(100px, auto); }

.first{
grid-column: 1 / 2;
grid-row: 1;
background-color: #f1c3c5;}
.second{
grid-column: 2 / 3;
grid-row: 1;
background-color: #f1c3c5;}
.third{
grid-column: 3 / 4;
grid-row: 1;
background-color: #f1c3c5;}