display: block; /* 改为 block 才能用 margin auto 居中 */

width: 250px;

height: 30px;

background-color: rgba(200, 160, 220, 0.3);

padding: 5px 10px;

border-radius: 3px;

font-family: Arial, sans-serif;

margin: 0 auto; /* 水平居中关键代码 */ ">

display: flex;

justify-content: space-between;

align-items: center;

height: 100%;

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