.sections{margin:0.5em 0;background:#f1f1f1;padding:0.75em;}
.section{float:left;width:50%;padding:0.75em;box-sizing:border-box;-ms-box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;}
.section_box{padding:1.25em 1.5em;border:1px solid #ddd;background:#fff;}

@media screen and (max-width: 768px) {
.section{float:none;width:auto;}
}
@media screen and (max-width: 600px) {
.sections{padding:0.5em;}
.section{padding:0.5em;}
}
@media screen and (max-width: 480px) {
.section_box{padding:1em 1.25em;}
}