为什么关于我们会溢出容器了呢,应该怎么改

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <title>Document</title>

    <style>
        *{
            padding: 0; margin: 0;
        }
        html{
            font-size: 50px;
        }
        /* 公共标题 */
        .common-title {
            width: 7.5rem;
            height: 0.9rem;
            background-color: #f00;
            text-align: center;
            line-height: 0.4rem;
        }
        .common-title .bg {
            color: #EFF6FB;
            height: 0.5rem;
            line-height: 0.5rem;
            font-size: 0.36rem;
            font-weight: 500;
        }
        .common-title .name {
            color: #333;
            /* height: 0.4rem;
            line-height: 0.4rem; */
            font-size: 0.3rem;
            z-index: 1;
            position: relative;
        }
        .common-title .circle {
            position: absolute;
            top: 0;
            right: 3px;
            width: 12px;
            height: 12px;
            display: inline-block;
            background: #FF6B00;
            border-radius: 50%;
            z-index: -1;
        }
    </style>
</head>
<body>
    <div class="common-title">
        <div class="bg">About Us</div>
        <span class="name">关于我们<i class="circle"></i></span>
    </div>
</body>
</html>