HTML 五边形钻石会员图标代码：带 V 字标识
<!DOCTYPE html>
<html>
<head>
<title>五边形钻石会员图标</title>
<style>
.diamond {
width: 100px;
height: 100px;
position: relative;
transform: rotate(45deg);
background: linear-gradient(to bottom right, #ffeb3b, #ffd600);
border-radius: 5px;
box-shadow: 1px 1px 5px #888888;
overflow: hidden;
}
.diamond:before {
content: "";
display: block;
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
transform: rotate(-45deg);
background: linear-gradient(to bottom right, #ffeb3b, #ffd600);
border-radius: 5px;
box-shadow: 1px 1px 5px #888888;
overflow: hidden;
}
.diamond:after {
content: 'V';
display: block;
font-size: 60px;
font-weight: bold;
color: #ffffff;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div class="diamond"></div>
</body>
</html>
<p>解释：</p>
<ul>
<li>使用 CSS3 的旋转 transform 技术，将正方形变成五边形钻石形状；</li>
<li>使用伪元素 :before 和 :after 分别实现钻石的上半部分和 V 形文字；</li>
<li>通过样式属性设置钻石的背景、边框、阴影等效果；</li>
</ul>
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