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How to Center a DIV Within a DIV

By Stephen Bucaro

<div style="display:flex; width:350px; height:350px; justify-content:center; align-items:center; border-style:solid;">
   <div style="border-style:solid; width:200px; height:200px;">
   </div>
</div>

This example uses the new CSS3 Flexible Box, or flexbox , which is a layout model providing for page layout when the page must accommodate different screen sizes and different display devices.

The outer container DIV element sets the value of the justify-content property to center, which centers the inner DIV element horizontally.

justify-content: flex-start|flex-end|center|space-between|space-around|initial|inherit;

Value	Description
flex-start	Default value. Items are positioned at the beginning of the container
flex-end	Items are positioned at the end of the container
center	Items are positioned at the center of the container
space-between	Items are positioned with space between the lines
space-around	Items are positioned with space before, between, and after the lines
initial	Sets this property to its default value
inherit	Inherits this property from its parent element

The outer container DIV element also sets the value of the align-items property to center, which centers the inner DIV element vertically.

align-items: stretch|center|flex-start|flex-end|baseline|initial|inherit;

Value	Description
stretch	Default. Items are stretched to fit the container
center	Items are positioned at the center of the container
flex-start	Items are positioned at the beginning of the container
flex-end	Items are positioned at the end of the container
baseline	Items are positioned at the baseline of the container
initial	Sets this property to its default value. Read about initial
inherit	Inherits this property from its parent element