.d {display:block; overflow:hidden; font-size:1px; position: relative; z-index: 10; background-color: inherit; visibility: visible;}

.b1,.b2,.b3,.b4,.b5,.b6,.b7,.b8,.b9,.b10,.b11,.b12,.b13,.b14,.b15,.b16,.b17,.b18,.b19,.b20 {height:1px; border-left:1px solid #000; border-right:1px solid #000; z-index:11;}
.oc{position: relative;}
.dc {display: block; border:0 solid black; padding-top: 1px; padding-bottom: 1px; z-index: 12; background-color: inherit;
border-top-width: inherit; border-top-color: inherit; border-right-width: inherit; border-right-color: inherit;
border-bottom-width: inherit; border-bottom-color: inherit; border-left-width: inherit; border-left-color: inherit; visibility: visible;}
.dc:after{ content: "."; display: block; height: 0; clear: both; visibility: hidden;} /*clear float hack*/
.clear{position: relative;    z-index: 13; }