If you are using SnowFlat theme then open its CSS file from
public_html/qa-themes/SnowFlat/qa-styles.css
Then find these CSS lines & change it:
Line no.834
@media (min-width: 1044px) {
.qa-body-wrapper {
width: 1024px; <--- Change this to 1280px --->
}
}
Line no.825
@media (min-width: 980px) {
.qa-main {
width: 74.5%; <--- Change this to 75.69% --->
float: left;
}
.qam-topbar, .qa-main-wrapper {
width: 100%;
}
}
Line no.2851
@media (min-width: 980px) {
.qa-sidepanel {
width: 25%; <--- Change this to 23.81% --->
padding: 0;
float: right;
*zoom: 1;
}
}
Now you can place a 300px wide image or google ads to the sidebar.