The sidebar ID is #secondary and its width is set using a percentage, as you can see in last line of the CSS here:
#secondary {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-ms-box-sizing: border-box;
box-sizing: border-box;
float: right;
margin-right: 3.645833333333%;
overflow: hidden;
width: 29.583333333333%;
}
If you widen this column you’ll need to compensate either by reducing the width of the main column accordingly, or widening the entire layout, which may have other effects on the theme.
As with my earlier post, you’ll definitely want to make these changes in a child theme to be sure they won’t be lost when you update the theme.
