<div class="dia-line-b"></div>

.dia-line-b{
height:10px;
background-image:
repeating-linear-gradient(45deg,#fff,#fff 5px,transparent 5px,transparent 11px,#fff 11px,#fff 16px),
repeating-linear-gradient(135deg,#fff,#fff 5px,#008 5px,#008 11px,#fff 11px,#fff 16px);
margin:5px 0px;
}