.container {
    max-width: 800px;
}
    .container h1 {
        margin-top:20px
    }

.ligne {
    width: 100%;
    height: 50px;
}

.cell-50 {
    float: left;
    width: 50%;
}

    .cell-50 button, .cell-50 a {
        width: 100%;
    }

.pl50 {
    padding-left: 50px;
}

.pr50 {
    padding-right: 50px;
}

div.cond {
    color: #666;
    margin-top: 30px;
    margin-bottom: 30px;
}