I'm afraid when it comes to changing the layout of side columns with css I know just enough to be dangerous. As a starting point you could try adding this code to your responsive_default.css, responsive_mobile.css & responsive_tablet.css - checking of course that it has no ill effects elsewhere:
Code:
@media (max-width:767px) {
.onerow-fluid>[class*="col"]:nth-child(3){float:none;}
}
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