:: after中與div中相同的線性漸變背景

Question

早上好，我希望背景與標題相同，線條漸變在哪里。

 html, body { margin: 0; background: #d8dfe9;} header{position: relative; height: 90px; width: 100%; background: linear-gradient(to right, #045FB4 0%,#00BFFF 100%);} header:after {content: ''; position: absolute; left: calc(50% - 4.8px); top: 90px; width: 0; height: 0; border-left: 10px solid transparent; border-right: 10px solid transparent; border-top: 10px solid blue; clear: both; z-index: 1;} main {position: relative; overflow: auto; ; height: 100vh;} main #timeline {position: relative; width: 100%; height: 70px; background: white} 

 <header> </header> <main> <div id="timeline"> </div> </main> 

拜托，你能幫我嗎？

Answer 1

最簡單的解決方案是使用clip-path

 html, body { margin: 0; background: #d8dfe9; } header { position: relative; height: 90px; width: 100%; background: linear-gradient(to right, #045FB4 0%, #00BFFF 100%); -webkit-clip-path: polygon(0% 0%, 100% 0%, 100% calc(100% - 10px), calc(50% + 10px) calc(100% - 10px), 50% 100%, calc(50% - 10px) calc(100% - 10px), 0% calc(100% - 10px)); clip-path: polygon(0% 0%, 100% 0%, 100% calc(100% - 10px), calc(50% + 10px) calc(100% - 10px), 50% 100%, calc(50% - 10px) calc(100% - 10px), 0% calc(100% - 10px)); } 

 <header> </header> 

或者，如果您想獲得比clip-path更好的支持但又沒有透明度，可以使用更多的漸變：

 html, body { margin: 0; background: #d8dfe9; } header { position: relative; height: 90px; width: 100%; background: linear-gradient(to right, #045FB4 0%, #00BFFF 100%) fixed; position:relative; } header:before { content:""; position:absolute; width:20px; height:10px; top:100%; right:calc(50% - 10px); background: linear-gradient(to bottom left,transparent 49%,#d8dfe9 50.5%) left/50% 100% no-repeat, linear-gradient(to bottom right,transparent 49%,#d8dfe9 50.5%) right/50% 100% no-repeat, linear-gradient(to right, #045FB4 0%, #00BFFF 100%) fixed; } 

 <header> </header>