Ok, if we're talking default template/theme here, than you should do following:
Since Headlines and latest news share same row (those three articles on the right side of headlines), you need to edit their wrappers.
You can find them in
css/layout default.css file:
Code:
/*********** equal_default *********************/
.features_equal_default #content_features_left {width: 342px;}
.features_equal_default #content_features_left {width: 228px;}
Now
content_features_left ID is where your headlines are wrapped in, so you need to edit that value, however, the
content_features_left ID needs to be reduced for as many pixels added to
content_features_left ID.
For example, if
content_features_left is enlarged by 100px (442px), than you need to reduce
content_features_left from 228px to 128px.
Hope that helps