The Buttons class is used to style all button-type elements within forms in vBulletin. These include <input type="button" />, <input type="submit" /> and <input type="reset" />.As with the Input Fields class, this class will inherit any unspecified settings from the system color scheme. You should read the warning note on the Input Fields class page for full details.
Note:
Under Windows® XP, form buttons will use the 'Luna' theme for their background and borders, unless a background color or a border style is applied. Specifying either one of these attributes will cause buttons to use the classic Windows® styling.
<input type="submit" class="button" value="Save Changes" accesskey="s" /> <br /> The button above uses the 'Button' class.