section {
        width: 48%;
        margin-left: 1%;
        margin-right: 1%;
        float: left;
}
section img {
    width: 100%;
}
iframe{
    max-width: 100%;
}
@media (max-width: 768px)
{
    section {
        padding-top: 1em;
        padding-bottom: 1em;
        width: 100%;
    }
}