to achieve such a glowing inverted triangle, why not just use the background image?
it's better to ask UI to give you a picture. It won't be troublesome
the following is a rough implementation of css
<div id='chevron'></div>
-sharpchevron {
position: relative;
text-align: center;
margin-bottom: 6px;
height: 100px;
width: 200px;
background: red;
}
-sharpchevron:before {
width: 0px;
height: 0px;
border-top: 50px solid red;
border-left: 100px solid transparent;
position: absolute;
left: 0;
top: 100%;
content: '';
}
-sharpchevron:after {
width: 0px;
height: 0px;
border-top: 50px solid red;
border-right: 100px solid transparent;
position: absolute;
right: 0;
top: 100%;
content: '';
}you still have a glowing pattern on this picture, so it's not bad to write it with code, but the loss outweighs the gain in time, compatibility and performance are also poor, so you'd better use the picture honestly.
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