body,ol,ul,h1,h2,h3,h4,h5,h6,p,th,td,dl,dd,form,fieldset,legend,input,textarea,select{margin:0;padding:0}
html, body{
    width: 100%;
    height: 100%;
}
.l{
    float: left;
}
.r{
    float: right;
}
.o{
    overflow:hidden;
}
li{
    list-style-type :none;
}