How to center a div with css

CSS How to center a div

In web page production, we often need to center a div element to make the page more beautiful and easier to read. This article will introduce several ways to center divs in CSS.

1. Use text-align to center

The text-align attribute is mainly used to set the alignment of inline content in block-level elements. When the value of the text-align attribute is center, the element content will be centered horizontally.

To center the div, you can set the width of the div element to a fixed value and set its margin property to auto, so that the div will appear in the center of its parent element.

CSS code is as follows:

div {
  width: 300px;
  margin: 0 auto;
  text-align: center;
}

The above CSS code sets the width of the div to 300px, the margin attribute is set to 0 auto, so that the div is horizontally centered, and the text-align attribute is set to center, so that The content of the div is also centered horizontally.

2. Use flex for centering

Flex is a layout method introduced by CSS3. Flex layout provides multiple attributes that can easily set grid, alignment, sorting and other functions, which is very suitable for Responsive layout.

To make a div centered using flex, you can set display: flex to its parent element and set attributes such as justify-content and align-items.

CSS code is as follows:

.container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.container div {
  width: 300px;
  height: 200px;
}

In the above code, the .container element is set to display: flex, which is used to generate a flexible container. The justify-content property is set to center to center all child elements horizontally; the align-items property is set to center to center all child elements vertically.

3. Use absolute positioning to center

Use absolute positioning to center the div element in its parent element. The specific steps are as follows:

Set the position attribute of the div element to absolute;

Set the top and left attributes of the div element to 0;

Set the margin attribute of the div element Set to auto;

Set the position attribute of the parent element to relative.

CSS code is as follows:

.parent {
  position: relative;
  height: 100%;
}

.child {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  width: 300px;
  height: 200px;
}

In the above code, the .parent element is set to position: relative for relative positioning. The .child element is set to position: absolute for absolute positioning. Set the top, left, right, and bottom attributes to 0, allowing the .child element to occupy the entire .parent element. Set the margin value to auto to center the .child element both horizontally and vertically.

To sum up, the above are three common CSS centering methods. Each method has its own advantages and disadvantages, and the specific application needs to be selected according to the actual situation.

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