<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>CSS3:透明度</title> ???<style type="text/css"> ???????div{ ???????????width:100px; ???????????height:100px; ???????????margin: 40px; ???????????display: inline-block; ???????????background-color: #ee3e80;} ???????p{ ???????????width: 100px; ???????????height: 100px; ???????????position: relative; ???????????top: 20px; ???????????left: 20px; ???????????margin:20px;} ???????p.one { ???????????background-color: rgb(0,0,0); ???????????opacity: 0.5;} ???????p.two { ???????????background-color: rgb(0,0,0); ???????????background-color: rgba(0,0,0,0.5);} ???</style></head><body><div><p class="one"></p></div><div><p class="two"></p></div></body></html>
CSS3:透明度
原文地址：https://www.cnblogs.com/max-hou/p/8537408.html