body{
    background-image: url(../image/deepslateBackground.webp);
    margin: 0;
}

header{
    background-image: url(../image/banniere.gif);
    margin-bottom: 50px;
}
.soustitre{
    text-align: center;
    color: aliceblue;
    font-family: Arial, Helvetica, sans-serif;
    padding-bottom: 10px;
    padding-top: 10px;
    font-size: 3vh;
}
.texte{
    text-align: center;
    display: flex;
    align-content: center;
    color: aliceblue;
    font-size: 2.4vh;
    margin-left: 100px;
    margin-right: 100px;
    font-family: Arial, Helvetica, sans-serif;
}

@media screen and (max-width: 768px) {

    body {
      background-size: cover;
      background-position: center;
    }
  
    header {
      margin-bottom: 20px;
      background-size: cover;
      background-position: center;
    }
    .soustitre {
        font-size: 2.4vh;
        padding: 8px 0;
    }
    .texte{
        margin-left: 25px;
        margin-right: 25px;
    }
}