body,h1,h2,h3,h4,h5,h6,hr,p,dl,dt,dd,ul,ol,li,pre,form,button,input,textarea,th,td{margin:0;padding:0;}
.lt{float: left;}
.rt{float: right;}
.clearfix:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}