#min-height

Defines the minimum height of the element.

默认属性 min-height: 0;

The element has no minimum height.

min-height: 200px;

You can use numeric values like pixels, (r)em, percentages...

If the minimum height is larger than the element's actual height, the min height will be applied.

min-height: 5px;

If the minimum height is smaller than the element's actual height, the min height has no effect.