复杂的背景图案
1.网格背景
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通过把两幅不同线宽、不同颜色的网格图案叠加起来形成的逼真蓝图网格
代码:
```
background:#58a;
background-image: linear-gradient(white 2px,transparent 0),
linear-gradient(90deg,white 2px,transparent 0),
linear-gradient(hsla(0,0%,100%,.3) 1px, transparent 0),
linear-gradient(90deg,hsla(0,0%,100%,.3) 1px,transparent 0);
background-size: 75px 75px,75px 75px,15px 15px,15px 15px;
```
```
111
```
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