<!DOCTYPE html><html><head><style type='text/css'>#lightbox { position: absolute; top: 0; bottom: 0; left: 0; right: 0; background-color: #000; opacity: .6;}#main { position: relative; background-color: #fff; z-index: 1;}</style></head><body> <div id="main">Lorem ipsum, my opactiy is not affected</div> <p>My opactiy is affected</p> <div id="lightbox"></div></body></html> 線上運行
原文地址：http://www.manongjc.com/article/1280.html
css :enabled與:disabled偽類別選取器使用方法和執行個體 css 偽類別選取器:checked執行個體講解 css :before選取器使用方法及執行個體介紹 css 如何將背景圖片固定在某一個地方 css :empty偽類別選取器
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
