W3School TIY Editor
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<!DOCTYPE html> <html> <head> <style> #grad1 { height: 200px; background-image: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet); } </style> </head> <body> <h1>线性渐变 - 彩虹效果</h1> <div id="grad1" style="text-align:center;margin:auto;color:#888888;font-size:40px;font-weight:bold"> 渐变背景 </div> </body> </html>