Hey Lauren,
Modifying the width, color, or other sort of appearance traits of things unfortunately requires customization and is outside the scope of our support forums.
Usually it requires CSS to make these sorts of changes. To write custom CSS on your site, definitely check out a [free!] tool like Firebug if you use FireFox, or the Developer Tools for either Safari or Chrome. They have “Inspector” tools that let you zoom right over the element and see what styles you can change to adjust their width, colors, padding, etc.
As a quick example of using CSS to make these sort of customization changes, here is some CSS that would modify the width of the sidebar calendar widget:
.widget.tribe_mini_calendar_widget {
width: 90% !important;
}
I hope this helps! 😀
Cheers,
George