In the menu.css file for that menu, find the block of code that looks like this:
ul#cssmw_content ul.level-1 > li > a {
background-color: #7CBAAA;
background-image: none;
border-bottom: solid 1px #3B6E72;
border-left: solid 1px #fff;
border-right: solid 1px #3B6E72;
border-top: solid 1px #fff;
color: #173232;
display: block;
font-family: Arial, Helvetica, sans-serif;
font-size: 10px;
font-style: normal;
margin: 0 0 0 0;
padding: 5px 5px 5px 5px;
text-decoration: none;
text-transform: uppercase;
width: 100px;
}
Change the width at the bottom to be 85px instead of 100px.