body{
    margin:0;
    background:#efe8d6;
    font-family:Georgia,serif;
    display:flex;
    justify-content:center;
    align-items:center;
    min-height:100vh;
}

.livre{
    width:min(90%,700px);
    background:white;
    border-radius:20px;
    box-shadow:0 20px 40px rgba(0,0,0,.15);
    overflow:hidden;
}

.couverture{
    padding:60px 40px;
    text-align:center;
    background:linear-gradient(#faf6ee,#efe5cf);
}

h1{
    font-size:48px;
    margin-bottom:15px;
    color:#2d2d2d;
}

.sousTitre{
    font-size:24px;
    color:#8b806d;
    margin-bottom:40px;
}

.texte{
    font-size:22px;
    line-height:1.8;
    color:#444;
}

.bouton{
    display:inline-block;
    margin-top:35px;
    background:#7fa77a;
    color:white;
    text-decoration:none;
    padding:15px 35px;
    border-radius:12px;
    font-size:20px;
}