#footer { background-color: #FFF; }
#footer > section {}
@media (min-width: 800px) {
    #footer { padding: 100px 0; }
    #footer > section { margin: 100px 0; }
}
@media (max-width: 799.99px) {
    #footer { padding:  50px 0; }
    #footer > section { margin:  50px 0; }
}
#footer > section:first-child { margin-top: 0; }
#footer > section:last-child { margin-bottom: 0; }