Sidebar gadgets (widgets) in separate boxes

in DESIGN -> EDIT HTML -> find this part:

.sidebar .widget, .main .widget {
background:#000000;
border:2px solid #681f10;
margin:0 0 1.5em;
padding:5px 7px 5px 7px;
}

you have to split those two widgets (read tat carefully), so they'll look like this:

.sidebar .widget {
background:#000000;
border:2px solid #681f10;
margin:0 0 1.5em;
padding:5px 7px 5px 7px;
}

.main .widget {
margin:0 0 1.5em;
padding:5px 7px 5px 7px;

}

preview and then save. 

Credits to pocket