线性小三角
```
.rightArrow::after{
content:'';
display: inline-block;
width: 18rpx;
height: 18rpx;
border: 2rpx solid #999;
border-left: none;
border-top: none;
transform: rotate(-45deg);
}
```
去除inlie-block元素的间隙
inline-block之间的间隙是因插入了空白换行或回车符所致
要处理这个间隙，得注意被转换为inline-block的元素，原本是inline level还是block level
文章来源：[inline-block元素间间隙产生及去除详解]
```
#demo{
font-size:0;
[;font-size:12px;];
*font-size:0;
font-family:arial;
[;letter-spacing:-3px;];
*letter-spacing:normal;
*word-spacing:-1px;
}
#demo span{
display:inline-block;
*display:inline;
*zoom:1;
font-size:14px;
letter-spacing:normal;
word-spacing:normal;
}
```
