.mainmenu li {
 color: #0bcb06;
}

.mainmenu A:link {text-decoration: none; color: #0bcb06;}
.mainmenu A:visited {text-decoration: none; color: #0bcb06;}
.mainmenu A:active {text-decoration: none; color: #0bcb06;}
.mainmenu A:hover {text-decoration: underline; color: darkgreen;}