sidebar font reduces size in widget

Why does the sidebar font size change to a smaller size for the Header 2 widget?  I initially had a Header 3 in the sidebar as the last widget and that widget had a smaller font size and Header 2 looked good.  Then when I removed Header 3 widget, which made Header 2 widget the last one - then Header 2 displayed a smaller font!

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Chris StanyonWebDevCommented:
Your widget is styled to be 1.2em in size:

.widget {

But then you have this rule:

.widget p:last-of-type, .widget ul > li:last-of-type, .widget-area .widget:last-of-type {
    margin-bottom: 0;
    font-size: 1em;

which basically, among other things, styles the last .widget in a .widget-area to a font-size of 1em;

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