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HTML

	<view class="content"><view class="item"></view></view>

CSS

	.content {height: 600rpx;display: flex;flex-direction: row;justify-content: center;align-items: center;background-color: aqua;}.item {width: 100rpx;height: 100rpx;border: 3rpx blueviolet solid;background-color: aquamarine;}

tailwind css

	<view class="h-[600rpx] flex flex-row justify-center items-center bg-green-600"><view class="w-[100rpx] h-[100rpx] border-[3px] bg-red-600"></view></view>