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In the stylesheet of your theme (normally qa-styles.css) change the width for each of the CSS classes .qa-main and .qa-sidepanel to 100% and also remove the float attribute from those classes. Beware that further adjustments may be required.

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I could not understand your speech properly.Please,tell me details about it.
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See updated answer. If you still don't understand what I'm talking about you need to familiarize yourself with CSS (cascading stylesheets) first.
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