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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>最终版无缝边框 Demo</title>
<style>
html {
font-size: 16px;
}
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
margin: 0;
padding: 20px;
box-sizing: border-box;
background-color: #f0f2f5;
}
.display-box {
display: inline-flex;
flex-direction: column;
position: relative;
min-width: 200px;
max-width: 560px;
min-height: 200px;
max-height: 500px;
background-color: #ffffff;
border-radius: 8px; /* 圆角半径 */
box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
/* 新增：隐藏超出容器的部分，用于裁剪光晕 */
overflow: hidden;
}
.display-box::before {
content: '';
position: absolute;
inset: 0;
border-radius: inherit;
pointer-events: none;
/* 新增：提升边框层级 */
z-index: 2;
background: red;
-webkit-mask:
linear-gradient(to right, white, transparent) top 0 left 6px / calc(33.33% - 6px) 1px no-repeat,
linear-gradient(to bottom, white, transparent) top 6px left 0 / 1px calc(33.33% - 6px) no-repeat,
linear-gradient(to left, white, transparent) bottom 0 right 6px / calc(33.33% - 6px) 1px no-repeat,
linear-gradient(to top, white, transparent) bottom 6px right 0 / 1px calc(33.33% - 6px) no-repeat,
radial-gradient(circle at bottom right, transparent 7px, white 7px, white 8px, transparent 8px) top left / 8px 8px no-repeat,
radial-gradient(circle at top left, transparent 7px, white 7px, white 8px, transparent 8px) bottom right / 8px 8px no-repeat;
mask:
linear-gradient(to right, white, transparent) top 0 left 6px / calc(33.33% - 6px) 1px no-repeat,
linear-gradient(to bottom, white, transparent) top 6px left 0 / 1px calc(33.33% - 6px) no-repeat,
linear-gradient(to left, white, transparent) bottom 0 right 6px / calc(33.33% - 6px) 1px no-repeat,
linear-gradient(to top, white, transparent) bottom 6px right 0 / 1px calc(33.33% - 6px) no-repeat,
radial-gradient(circle at bottom right, transparent 7px, white 7px, white 8px, transparent 8px) top left / 8px 8px no-repeat,
radial-gradient(circle at top left, transparent 7px, white 7px, white 8px, transparent 8px) bottom right / 8px 8px no-repeat;
}
/* 修改：创建椭圆形光晕效果 */
.display-box::after {
content: '';
position: absolute;
/* 尺寸：椭圆形，宽度60%，高度40% */
width: 60%;
height: 0;
padding-bottom: 40%; /* 使用padding-bottom技巧创建响应式椭圆形 */
/* 定位到左下角 */
left: 0;
bottom: 0;
/* 使用transform将椭圆中心向右移动30% */
transform: translate(-20%, 50%);
/* 创建椭圆形径向渐变光晕 */
background: radial-gradient(ellipse at center, rgba(255, 0, 0, 0.25) 0%, transparent 70%);
border-radius: 50%;
}
.display-box-content {
padding: 1.25rem;
padding-right: 2.5rem;
box-sizing: border-box;
overflow-y: auto;
/* 新增：提升内容层级，使其位于光晕之上 */
position: relative;
z-index: 1;
scrollbar-width: thin;
scrollbar-color: #c1c1c1 #f1f1f1;
}
.title { font-size: 0.875rem; color: #303133; line-height: 1.5; white-space: nowrap; }
.title .label { font-weight: bold; color: red; font-size: 1rem; margin-right: 0.5em; }
.details { margin-top: 0.5rem; }
.suggestion { margin-top: 1rem; }
.details h3, .suggestion h3 { font-size: 1rem; color: #303133; margin-top: 0; margin-bottom: 0.25rem; font-weight: 600; }
.details-content, .suggestion-content { font-size: 0.875rem; color: #606266; line-height: 1.7; }
.details-content { min-height: 50px; }
</style>
</head>
<body>
<div class="display-box">
<div class="display-box-content">
<div class="title">
<span class="label">标题:</span><span>关于系统功能更新的详细说明</span>
</div>
<div class="details">
<h3>详情</h3>
<div class="details-content">
<p>此版本在左下角新增了一个椭圆形的渐变光晕效果，作为视觉点缀。</p>
</div>
</div>
<div class="suggestion">
<h3>建议</h3>
<div class="suggestion-content">
<p>这个效果是通过 ::after 伪元素结合椭圆形径向渐变和 overflow: hidden 实现的，光晕中点已向右移动。</p>
</div>
</div>
</div>
</body>
</html>