.l50t0{
position: absolute;
top:0;
left: 50%;
margin-left: -350px;
width: 700px;
height: 10px;
border-style: solid;
border-color: black;
border-width: 0px;
z-index:1;
}
.l0t0{
position: absolute;
top:0;
left:0;
width: 10px;
height: 10px;
border-style: solid;
border-color: black;
border-width: 0px;
z-index:1;
}