Setting the width of a block-level

Setting the width of a block-level element will prevent it from stretching out to the edges of its container. Use margin: auto;, to horizontally center an element within its container.

The element will then take up the specified width, and the remaining space will be split equally between the two margins:

Results (English) 3:

设置一个块级元素的宽度会阻止它从它的容器的边缘伸出。使用余量：自动；向水平中心的元素在其容器内，然后，该元素将占用指定的宽度，剩余的空间将平分两者之间的利润率：