Detailed graphic explanation of how to use the CSS align-content property

Most front-end workers should be familiar with some commonly used CSS properties, so today let’s talk about the slightly uncommon CSS properties. Do you know how to use the CSS align-content property? What are the attribute values ​​of align-content? Friends who want to know, please continue to read below.

1. Definition and usage of CSS align-content attribute

Definition: The align-content attribute does not occupy all available items on the cross axis in the flexible container. of space to align items within the container (vertically).

Function: It will set the vertical arrangement of each item inside the free box.

Conditions: The attribute display:flex must be set on the parent element, and line wrapping must be set, flex-wrap:wrap so that the setting of this attribute will take effect.

Setting: This attribute affects the items in its container, so just set it on the parent element.

The value of align-content can be set as needed when using it.

stretch: Stretched to fit the container (default).
center: Located in the center of the container.
flex-start: Located at the beginning of the container.
flex-end: Located at the end of the container.
space-between: Located within a container with white space between lines.
space-around: Located in a container with white space before, between, and after each line.

Writing: align-content: stretch|center|flex-start|flex-end|space-between|space-around

2. Align-content instance analysis

Description: There are four small divs inside a div outside. In order to see the effect clearly, set different colors for it, and then add align-content: center;
to the big div. The div inside can be centered vertically in the container. The code is as follows:

HTML part:

<div class="box">
    <div style="background-color:red;"></div>
     <div style="background-color:orange;"></div>
     <div style="background-color:yellow;"></div>
     <div style="background-color:green;"></div>
  </div>

CSS part:

.box {
      width: 100px;
      height: 300px;
      border: 1px solid #c3c3c3;
      display: -webkit-flex;
      display: flex;
      -webkit-flex-wrap: wrap;
      flex-wrap: wrap;
      -webkit-align-content: center;
      align-content: center;
  } 
  .box div {
      width: 100px;
      height: 50px;
  }

Rendering:

Summary: The picture effect is clear at a glance. After setting align-content: center to the parent element, the elements inside will be vertically centered in the container. As for other effects, I will not demonstrate them one by one here. You can try it yourself and see. Is it consistent with the conclusion? Especially beginners should practice more.

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