Hi,
Try this:
open this CSS file:
/templates/flexible_coolmart/css/responsive.css
and to the bottom, add this CSS rule:
@media screen and (max-width:568px) {
#innerbottom-b .grid-box, #innerbottom .grid-box {
width:100% !important;
}
}
The above CSS rule means; If the screen resolution drops below 568px (which is where the module layout starts from) the modules inside the #innerbottom-b and #innerbottom will have 100% width size, therefore they will be listed one below each other, instead of side-by side.
If you understand the idea, you can play around with the CSS rule.
Regards,
Support.