ipi-jquery/exemples/jquery/styles-largeur-et-hauteur-dun-element/styles.css

/* styles.css */
div {
    padding: 10px;
}
.wrapper {
    background: #999;
}
.inner {
    margin-bottom: 20px;
}
.wrapper div:nth-child(2) {
    background: #bef;
    margin-left: 40px;
}
.wrapper div:nth-child(3) {
    background: #efb;
    border: 10px solid #bbb;
}