小三角（圆角）
```
.div:after{
z-index: 9999999;
border: 14.5px solid rgba(71,83,95,1);
border-left: 14.5px solid transparent;
border-top: 14.5px solid transparent;
border-bottom-right-radius: 5px;
width: 0;
content: "";
position: absolute;
transform: rotate(-45deg);
right: -14px;
bottom: 5px;
}
```
小三角（普通）
```
.div:after{
width: 0;
height: 0;
border:20.5px solid transparent;
border-left-color:rgba(71,83,95,1);
content: "";
display: inline-block;
position: absolute;
right: -41px;
}
```
