css实现表格右上角一个小的三角形标示----伪类div::before

<div data-v-b3edeae6="" class="picker-day today">8</div>

.picker-box .picker-box-c .picker-content .picker-con .picker-day[data-v-b3edeae6]  {

1. position: relative;
2. width: 1.33333rem;
3. height: 1.06667rem;
4. line-height: 1.06667rem;
5. margin: 0.02667rem 0;
6. colors: #555;
7. font-weight: 600;
8. text-align: center;

}

.today{
&::before{
content:"";
position:absolute;
top:0;
right:0;
height:0;
width:0;
border-top:8px solid #1486f5;
border-left:8ps solid transparent;
}
}