antd-mobile/cjs/components/auto-center/auto-center.css

<img src="https://gw.alipayobjects.com/mdn/rms_ee68a8/afts/img/A*hjjDS5Yy-ooAAAAAAAAAAAAAARQnAQ" alt="logo" width="100%" />

.adm-auto-center {
  display: flex;
  justify-content: center;
}
.adm-auto-center-content {
  flex: 0 1 auto;
}