position: absolute;
content: " ";
top: 10px;
left: -16px;
display: block;
width: 0;
height: 0;
border: 8px solid rgba(255, 87, 51, 0.1);
border-color: transparent rgba(255, 87, 51, 0.1) transparent transparent;
z-index: 111;
class名字:after{
left: -17px;
border-color: transparent rgba(255, 87, 51, 0.1) transparent transparent;
z-index: 11;
}
