.b1, .b2, .b3, .b4{font-size:1px; overflow:hidden; display:block;}
.b1 {height:1px; background:#D1D1D1; margin:0 5px;}
.b2 {height:1px; background:#fff; border-right:2px solid #D1D1D1; border-left:2px solid #D1D1D1; margin:0 3px;}
.b3 {height:1px; background:#fff; border-right:1px solid #D1D1D1; border-left:1px solid #D1D1D1; margin:0 2px;}
.b4 {height:2px; background:#fff; border-right:1px solid #D1D1D1; border-left:1px solid #D1D1D1; margin:0 1px;}
.contentb {background: #fff; border-right:1px solid #D1D1D1; border-left:1px solid #D1D1D1;}
.contentb div {margin:0;}