body{background:#222226}.zigzag{background:#fff;position:relative;height:30px;box-shadow:0 15px 10px rgba(0,0,0,0);z-index:1}.zigzag::after{content:"";display:block;height:30px;position:absolute;top:100%;left:0;right:0;background:-webkit-linear-gradient(225deg,#fff 15px,transparent 0) 0 15px,-webkit-linear-gradient(315deg,#fff 15px,transparent 0) 0 15px;background:linear-gradient(-135deg,#fff 15px,transparent 0) 0 15px,linear-gradient(135deg,#fff 15px,transparent 0) 0 15px;background-position:top left;background-repeat:repeat-x;background-size:30px 30px}