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HTML部分：
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <link rel="stylesheet"
type="text/css" href="./index.css" /> </head> <body> <button class="publish">
我要提问</button> </body> </html>
CSS部分：
.publish { width: 100%; height: 50px; line-height: 50px; /*渐变方向*/ background:
linear-gradient(to right, #95ca47, #4dc891);/*从左到右*/ background: linear-gradient
(to left bottom, #95ca47, #4dc891);/*从右上到左下*/ /*渐变位置*/ background:
linear-gradient(to right, #95ca47 30%, #4dc891 70%);/*百分比用来约定渐变的起止位置*/ color:
#fff; font-size: 18px; border-radius: 4px; font-weight: 500; box-shadow: 0 2px
6px 0rgba(104, 200, 116, 0.3); /*1*/ }