Make div 100% height of browser window/设置div等于浏览器的高度

Viewport-Percentage (or Viewport-Relative) Lengths

Viewport-Percentage Lengths：

The viewport-percentage lengths are relative to the size of the initial containing block. When the height or width of the initial containing block is changed, they are scaled accordingly.

• vh 　　(viewport height)
• vw 　　(viewport width)
• vmin 　　(viewport minimum length)
• vmax 　　(viewport maximum length)

What exactly is vmin and vmax?

• 1vmin assumes a value of the smallest between 1vh and 1vw.
• 1vmax assumes a value of the largest between 1vh and 1vw.

FROM stackoverflow