ul, ol, li{list-style-type: none;}

/*------------------------- constant style -----------------------------*/
.left{float:left;}
.right{float:right;}
.clear{clear:both;}
.block{display:block;}
.ct{margin:0 auto;}
.ac {text-align:center;}
.al{text-align:left;}
.ar{text-align:right;}
.r{margin:0px; padding:0px; border:none; list-style: none;}
.none{text-indent:-9999px; font-size:1%; overflow:hidden;}
.n{display:none;}
.block{display:block;}

/* constant typography */
.b{font-weight:bold;}