.a{ border-left-color:#CCCCCC; border-left-style:solid; border-left-width:1px; border-right-color:#CCCCCC; border-right-style:solid;
    border-right-width:1px; border-top-color:#CCCCCC; border-top-style:solid; border-top-width:1px; }
.b{border-bottom-color:#CCCCCC; border-bottom-style:solid; border-bottom-width:1px;}
.c{border-bottom-color: #999999; border-bottom-style: dashed; border-bottom-width:1px;}
.d{border-bottom-color: #999999; border-bottom-style:solid; border-bottom-width:1px;}