CSS3 @media Rule

<style>
/* Desktop/PC View */
@media screen and (min-width: 1024px) {
    #geeksup table.mobile {
        display:none;
    }
}

/* Mobile View */
@media screen and (max-width: 1023px) {
    #geeksup table.desktop {
        display:none;
    }
}
</style>