.menu_line {border-style: none; background-color: lightblue; 
            width:100%; text-align: center}
.main_item {background-color: lightblue}
.main_selected {background-color: red}
A.main_href {color: darkblue; text-decoration: none; 
             font-family: "times new roman"}

.item {background-color: lightblue}
.selected {background-color: red} 
A.main_href {}

.menu {border-style: solid; border-width: 1px; 
       visibility: visible; position: absolute;
       background-color: lightblue; border-color: black}
.hidden {display: none}

.exp {background-color: lightblue}
.exp_ref {text-decoration: none; font-weight: bold}
.expbody {display: block; background-color: lightblue}
.exp_hidden {display: none}