.bord_top { position:absolute; width:0%; top:0px; opacity:0; }
.bord_right { position:absolute; height:0%; right:0px; opacity:0; }
.bord_bottom { position:absolute; width:0%; bottom:0px; opacity:0; }
.bord_left { position:absolute; height:0%; left:0px; opacity:0; }