HTML+CSS实现时间轴效果

以下是一个简单的HTML和CSS代码示例，用于实现时间轴效果：



<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>时间轴示例</title>
<style>
    body {
        font-family: Arial, sans-serif;
    }
    .timeline {
        list-style-type: none;
        padding: 0;
        position: relative;
    }
    .timeline-item {
        position: relative;
        margin-bottom: 20px;
    }
    .timeline-item-content {
        background: #f9f9f9;
        padding: 15px;
        border-radius: 5px;
        box-shadow: 0 3px 6px rgba(0, 0, 0, 0.05);
    }
    .timeline-item-year {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        color: #17a2b8;
        top: -20px;
        font-weight: 600;
        font-size: 16px;
    }
    .timeline-item-circle {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        background: #17a2b8;
        width: 16px;
        height: 16px;
        border-radius: 50%;
        top: 0;
        z-index: 1;
    }
    .timeline-item-circle::after {
        content: '';
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        width: 12px;
        height: 12px;
        background: #f9f9f9;
        border-radius: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }
    .timeline-item-line {
        position: absolute;
        width: 100%;
        height: 100%;
        z-index: 0;
        top: 16px; /* Account for the height of the circle */
        left: 50%;
        transform: translateX(-50%);
    }
    .timeline-item-line::before {
        content: '';
        position: absolute;
        width: 2px;
        height: 100%;
        background: #17a2b8;
        left: 50%;
        top: 0;
        transform: translateX(-50%);
    }
</style>
</head>
<body>
 
<ul class="timeline">
    <li class="timeline-item">
        <div class="timeline-item-circle"></div>
        <div class="timeline-item-line"></div>
        <div class="timeline-item-content">
            <span class="timeline-item-year">2023</span>
            <p>开始学习编程。</p>
        </div>
    </li>
    <li class="timeline-item">
        <div class="timeline-item-circle"></div>
        <div class="timeline-item-line"></div>
        <div class="timeline-item-content">
            <span class="timel
HTML+CSS实现时间轴效果

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