Alternatively, if you wanted to keep the line height as it is, you could change the menu.css
ul#cssmw0 ul.level-1 > li > a {
background-color: #FFCC00;
background-image: url("../cssmw0_images/");
border-color: #FFCC00;
color: #173232;
display: block;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 24px;
font-style: normal;
font-weight: normal;
margin: 0 0 -2px 0; /* give the bottom margin a negative value */
padding: 8px 5px; /* increase value of top and bottom padding to compensate */
text-align: center;
text-decoration: none;
text-transform: lowercase;
width: 160px;
}