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How to center an item both horizontally and vertically using Flexbox?
How to center an item both horizontally and vertically using Flexbox?
Jun 22, 2025 am 12:22 AM
To center elements horizontally and vertically in the container, 1. Set the container as a Flex container, use display: flex; 2. Use justify-content: center to center the main axis direction; 3. Use align-items: center to center the cross axis direction; if the container has multiple child elements, it will be arranged horizontally and centered overall by default. If you need to arrange vertically, you can combine flex-direction: column and keep the alignment attribute unchanged, and the centering effect can still be achieved.
To center an element horizontally and vertically in a container, using Flexbox is one of the easiest and most effective ways to do it. Just set a few key CSS properties and it can be easily implemented.
Set the container to Flex container
First, you need to set display property of the parent container flex , which is the prerequisite for using Flexbox.
.container {
display: flex;
}This is not enough, and two alignment methods are needed next.
Use justify-content and align-items
These two properties control the alignment on the spindle and cross axis, respectively.
.container {
display: flex;
justify-content: center; /* horizontal center*/
align-items: center; /* vertical center*/
}-
justify-contentcontrols the alignment of the spindle direction (default is horizontal). -
align-itemscontrols the alignment of the cross axis direction (default is portrait).
As long as they are set as center , the child elements inside will be automatically centered.
Tip: If the container has only one child element, this method is very direct; if there are multiple child elements, it will be arranged in a row and centered as a whole by default.
Handle more complex situations
Sometimes you may want the child elements to be centered under certain conditions, or you may want them to behave consistently under different screen sizes.
For example, you can combine flex-direction to change the spindle direction:
.container {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}At this time, the main axis becomes vertical, but because the two alignments have also been adjusted, the child elements will eventually be centered.
Also, if you want the container itself to be centered on the page, consider adding margin: 0 auto to it or setting the outer container to Flex and aligning it.
Basically that's it. Flexbox is designed to simplify layout, and this horizontal and vertical centering method is one of its most commonly used scenarios.
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