博客头部随机背景图
<header id="header" style="background-image:url(<?php $this->options->themeUrl('img/'.mt_rand(1,8).'.png'); ?>) ;">相当好玩的背景图
background-image:radial-gradient(circle at 28% 29%, #ededed06 0%, #ededed06 50%, #88888806 50%, #88888806 100%), radial-gradient(circle at 8% 78%, #9c9c9c06 0%, #9c9c9c06 50%, #25252506 50%, #25252506 100%), linear-gradient(90deg, #fff, #fff);