Highlight an item in the main navigation by turning it into a button using a class. Add a class to the menu item in the appearance>menu section. You will need to click on screen options and check the CSS classes option to see it below.

.menu-button a {
-moz-osx-font-smoothing: grayscale;
background: #00a79d none repeat scroll 0 0;
border: 2px solid;
border-radius: 4px;
color: #ffffff !important;
cursor: pointer;
line-height: 1.7em;
margin: 4px auto;
padding: 0 8px !important;
transition: all 0.2s ease 0s;
}
.menu-button a:hover{
background-color:#007D73;
}

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