# 图片
.img-responsive 让图片支持响应式布局
.img-rounded 圆角图片
.img-circle 圆形图片
.img-thumbnail 加边框和间距的图片(自带响应)
.center-block 图片水平居中类(不要用.text-center)
```
<img src="images/cat.jpg" width="800" class="img-responsive" alt="">
<hr>
<img src="images/cat.jpg" width="800" class="img-circle img-responsive" alt="">
<hr>
<img src="images/cat.jpg" width="800" class="img-rounded img-responsive" alt=""> <hr>
<img src="images/cat.jpg" width="800" class="img-thumbnail" alt="">
```