每次刷新随机切换背景
截图：
图片资源来自： https://unsplash.it/
css代码：
html, body { height: 100%; }
body { background-color: #505770; background-image: url(https://unsplash.it/1600/900?random); background-repeat: no-repeat; background-attachment: fixed; background-position: center 0; background-size: cover; }
#Top{ position: fixed; top: 0; right: 0; left: 0; background: #fff; background: rgba(255,255,255,.94); box-shadow: 0 0 1px 0 rgba(0,0,0,.3),0 0 6px 2px rgba(0,0,0,.15); }
#Wrapper{ padding-top: 45px; background: none; }
.box{ border: none; border-radius: 2px; background: rgba(255,255,255,.98); box-shadow: 0 0 2px rgba(0,0,0,.2); }
#Bottom{ border: none; background: rgba(255,255,255,.94); box-shadow: 0 0 2px rgba(0,0,0,.2); }
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