<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
border-width: 0;
}
.flag {
width: 300px;
height: 200px;
background: red;
position: relative;
}
.pentagramMain {
margin-top: 40.73px;
margin-left: 21.47px;
width: 0;
height: 0;
border-top-color: yellow;
border-left-color: transparent;
border-right-color: transparent;
border-top-width: 20.73px;
border-left-width: 28.53px;
border-right-width: 28.53px;
border-style: solid;
position: absolute;
}
.pentagramMain::before {
border-width: 0;
content: '';
display: block;
width: 0;
height: 0;
border-top-color: yellow;
border-left-color: transparent;
border-right-color: transparent;
border-top-width: 20.73px;
border-left-width: 28.53px;
border-right-width: 28.53px;
border-style: solid;
position: absolute;
top: -20.73px;
left: -28.53px;
transform: rotate(72deg);
transform-origin: 28.53px 9.27px;
}
.pentagramMain::after {
border-width: 0;
content: '';
display: block;
width: 0;
height: 0;
border-top-color: yellow;
border-left-color: transparent;
border-right-color: transparent;
border-top-width: 20.73px;
border-left-width: 28.53px;
border-right-width: 28.53px;
border-style: solid;
position: absolute;
top: -20.73px;
left: -28.53px;
transform: rotate(-72deg);
transform-origin: 28.53px 9.27px;
}
/* 小五角星 */
.pentagram {
width: 0;
height: 0;
position: absolute;
border-top: 6.91px solid yellow;
border-left: 9.51px solid transparent;
border-right: 9.51px solid transparent;
transform-origin: 9.51px 3.09px;
}
.pentagram::before {
position: absolute;
width: 0;
height: 0;
content: '';
display: block;
border-top: 6.91px solid yellow;
border-left: 9.51px solid transparent;
border-right: 9.51px solid transparent;
top: -6.91px;
left: -9.51px;
transform: rotate(72deg);
transform-origin: 9.51px 3.09px;
}
.pentagram::after {
border-width: 0;
content: '';
display: block;
width: 0;
height: 0;
border-top-color: yellow;
border-left-color: transparent;
border-right-color: transparent;
border-top: 6.91px solid yellow;
border-left: 9.51px solid transparent;
border-right: 9.51px solid transparent;
border-style: solid;
position: absolute;
top: -6.91px;
left: -9.51px;
transform: rotate(-72deg);
transform-origin: 9.51px 3.09px;
}
.one {
top: 16.91px;
left: 90.49px;
transform: rotate(-48.96deg);
}
.two {
top: 36.91px;
left: 110.49px;
transform: rotate(-26.13deg);
}
.three {
top: 66.91px;
left: 110.49px;
transform: rotate(-2.06deg);
}
.four {
top: 86.91px;
left: 90.49px;
transform: rotate(20.66deg);
}
</style>
</head>
<body>
<div class='flag'>
<div class='pentagramMain'></div>
<div class='pentagram one'></div>
<div class='pentagram two'></div>
<div class='pentagram three'></div>
<div class='pentagram four'></div>
</div>
</body>
</html>
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