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This article mainly introduces CSS how to achieve width-to-height ratio layout related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe you will have something to gain after reading this CSS how to achieve width-to-height ratio layout article, let's take a look.

Width is twice the height (proportional scaling)

Implementation idea: based on the parent element, the child width:100%; (that is, 100% of the parent width) and padding-top:50% (that is, 50% of the parent width. According to the css specification, if padding is expressed as a percentage, padding: 100% is equal to the width of the parent element)

Why not directly `width: 50%; height: 50% investors?

Then the height becomes 50% of the parent's height (undesirable, unless the parent's width and height are equal).

Original title:

The red block element is vertically centered in the center of the screen.

The red block-level elements are 20px away from the left and right edges of the screen.

The content in the red block level element is centered horizontally and vertically.

The height of the red block-level element is always 50% of the width of the red block-level element.

The aspect ratio of the red part is 2:1

Source code:

The aspect ratio is fixed. Overflow: hidden; position: absolute; left: 10px; right: 10px; top: 50%; transform: translateY (- 50%); background-color: # 0c8ac5;} .son {width: 100%; padding-top: 50% Background-color: # c03035;} span {position: absolute; top: 50%; left: 50%; transform: translate (- 50%,-50%); font-size: 20px; color: # D8D8D8;} img {float: left Margin-right: 10px; border: 2px solid # fdf6e3;}

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