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How to center a button element vertically and horizontally with CSS?
To center a button vertically and horizontally with CSS, use the justify-content and align-items properties with flexbox. This creates perfect centering for button elements within their container.
Syntax
.container {
display: flex;
justify-content: center;
align-items: center;
height: value;
}
The Justify-content Property
In CSS, the justify-content property is used to align the items horizontally. The syntax of CSS justify-content property is as follows −
Selector {
display: flex;
justify-content: /*value*/;
}
The following are the values −
flex-start − The flex items are positioned at the start of the container. This is the Default value.
flex-end − The flex items are positioned at the end of the container
center − The flex items are positioned in the center of the container
space-between − The flex items will have space between them
space-around − The flex items will have space before, between, and after them
space-evenly − The flex items will have equal space around them
The Align-items Property
In CSS, the align-items property is used to set the default alignment for flex-items in a flexbox. It aligns the items vertically.
The syntax of CSS align-items property is as follows −
Selector {
display: flex;
align-items: /*value*/;
}
The following are the values −
stretch − The flex-items are stretched to fit the container
center − The flex-items are positioned at the center of the container
flex-start − The flex-items are positioned at the beginning of the container
flex-end − The flex-items are positioned at the end of the container
Example: Centering a Button
The following example demonstrates how to center a button both vertically and horizontally using flexbox −
<!DOCTYPE html>
<html>
<head>
<style>
.centered {
display: flex;
justify-content: center;
align-items: center;
height: 200px;
border: 3px solid rgb(0, 70, 128);
background-color: #f9f9f9;
}
button {
font-size: 18px;
border: none;
padding: 15px 25px;
background-color: darkblue;
color: white;
border-radius: 5px;
cursor: pointer;
}
</style>
</head>
<body>
<h1>Centered Button Example</h1>
<div class="centered">
<button>This button is centered</button>
</div>
</body>
</html>
The output of the above code is −
A dark blue button with white text "This button is centered" appears perfectly centered both horizontally and vertically within a bordered container.
Key Points
Set
display: flexon the parent containerUse
justify-content: centerfor horizontal centeringUse
align-items: centerfor vertical centeringThe container must have a defined height for vertical centering to be visible
Conclusion
Using flexbox with justify-content: center and align-items: center is the most reliable method to center buttons both vertically and horizontally. This technique works consistently across modern browsers and provides responsive centering.
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