Introduction
Vertically aligning HTML
contents in CSS
has always been a herculean task and has been described by many web developers as tricky to implement. However, modern CSS
has made available a number of ways to vertically align HTML
contents easily. Content alignment has never been easier at this time, and in this article, we'll look at different techniques to vertically align HTML
content using CSS
.
Vertical alignment using margins
Margins in CSS
are used to generate space around the borders of contents.
Here are examples on how to easily vertically align contents with margins.
Example
Using the CSS
property margin:auto
, You can vertically and horizontally align HTML
contents to the center. However, this is possible only when the following conditions are met:
- The parent element should have a given
height
. - The child element should have a specified
height
. - The parent element should have either a display of
flex
orgrid
.
A sample of this can be displayed below:
HTML CODE:
<html>
<body>
<section class="parent-element">
<div class="child-element">The text is here!</div>
</section>
</body>
</html>
CSS CODE:
.parent-element {
display: [flex or grid];
height: 500px;
border: 1px solid #000;
}
.child-element {
margin: auto;
}
Vertical alignment with Flexbox
Flexbox is a CSS3
layout module that aims to simplify the process of designing flexible, responsive layout structures without the need for positioning or float. Unlike some other CSS frameworks, it is orientation agnostic and lets you automatically align and resize containers based on the height and width of the screen.
Here are examples on how to effortlessly vertically align contents with flexbox.
Example 1
With the CSS properties display: flex
, align-items: center
and justify-content: space-around
, we can vertically and horizontally align HTML
contents.
HTML CODE:
<html>
<body>
<div class="nav">
<div class="nav-item">Home</div>
</div>
</body>
</html>
CSS CODE:
.nav {
display: flex;
justify-content: space-around; /* aligns the items horizontally */
align-items: center; /* aligns the items vertically */
height: 100px;
background-color: #333;
color: #fff;
}
Example 2:
With the CSS properties display: flex
, align-items: center
and justify-content: center
, we can also vertically align HTML
contents.
We will update the first example CSS
code to show this:
CSS CODE:
.nav {
display: flex;
height: 100px;
background-color: #333;
color: #fff;
justify-content: center; /* aligns the items horizontally */
align-items: center; /* aligns the items vertically */
}
Vertical alignment using CSS Grid.
The CSS Grid Layout Module provides a two dimension grid-based layout system with rows and columns, allowing you to design web pages with ease.
Here are examples on how to effortlessly vertically contents with flexbox.
Example 1:
With the CSS properties display: grid
, align-items: center
and justify-content: center
, we can also vertically align HTML
contents.
HTML CODE:
<html>
<body>
<div class="grid">
<div class="item">Centered Item</div>
</div>
</body>
</html>
CSS CODE:
.grid {
display: grid;
height: 97vh;
justify-content: center; /* aligns the items horizontally */
align-items: center; /* aligns the items vertically */
border: 1px solid #000;
}
.item {
font-size: 20px;
}
Example 2:
With the CSS properties display: grid
, place-items: center
(which is a combination of align-items: center
and justify-content: center
), we can also vertically align HTML
contents.
We will update the CSS
code of the first example to show this:
CSS CODE:
.grid {
display: grid;
height: 97vh;
place-items: center; /* aligns the items vertically and horizontally */
border: 1px solid #000;
}
.item {
font-size: 20px;
}
Example 3:
With the CSS properties display: grid
, align-self: center
, we can also vertically align HTML
contents.
We will update the CSS
code of the first example to show this:
CSS CODE:
.grid {
display: grid;
height: 97vh;
border: 1px solid #000;
}
.item {
align-self: center; /* aligns the items vertically only */
font-size: 20px;
}
Vertical alignment using table display (display: table)
Tables are a common and useful tool for displaying data on websites and web applications. It was the common method of presenting information in rows and columns before to the introduction of modules like flex
and grid
.
Here are examples on how to vertically align contents with tables
.
Example:
Using the CSS
property display: table
, display: table-cell
, vertical-align: middle
, You can vertically align contents to the center. However, this is possible only when the following conditions are met:
- The parent element must have the
display: table
property. - When the parent element must have a given
height
. - The child element must have the
display: table-cell
property. - The child element must have the
vertical-align: middle
property.
A sample of this can be displayed below:
HTML CODE:
<html>
<body>
<div class="parent-element">
<div class="child-element">Center text!</div>
</div>
</body>
</html>
CSS CODE:
.parent-element {
display: table; /* table display*/
height: 50vh;
width: 100%;
border: 1px solid black;
}
.child-element {
display: table-cell; /* table-cell display*/
vertical-align: middle; /* vertical align*/
text-align: center;
}
Vertical alignment using absolute positioning (position: absolute)
The position CSS
property specify how an element is positioned in a document. Positioned elements' final positioning is determined by their top
, right
, bottom
, and left
properties.
We could use these positioning properties to vertically align contents.
Example:
Using the CSS
properties position: relative
and position; absolute
and margin; auto
, You can vertically align contents to the center. However, this is possible only when the following conditions are met:
- The parent element must have the
position: relative
property. This is to ensure that the positioning of the element occurs solely within the parent container and does not extend outside it. - The parent element should have a specified
height
. - The child element must have the
position: absolute
property - The child element should have the positioned properties:
top: 0;
bottom: 0;
left: 0;
right: 0;
- The child element should have a specified
height
as well.
HTML CODE:
<html>
<body>
<div class="parent-element">
<div class="child-element">Center text!</div>
</div>
</body>
</html>
CSS CODE:
.parent-element {
position: relative;
height: 50vh;
border: 1px solid black;
}
.child-element {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
height: 20px; /* requires explicit height*/
border: 1px solid black;
text-align: center;
}
Vertical alignment using css transforms
The translate()
CSS
property repositions an element in both horizontal and vertical directions.
We will give examples on how to use the translate property.
Example 1
Using the CSS
properties position: relative
and position; absolute
and transform: translate(-50%, -50%)
, You can vertically and horizontally align contents to the center. This has been a popular way to vertically align contents. However this is possible only when the following conditions are met:
- The parent element must have the
position: relative
property. - The parent element should have a specified
height
. - The child element must have the
position: absolute
property. - The child element should have the positioned properties:
top: 50%;
left: 50%;
. - The child element should have the translate property:
transform: translate(-50%, -50%);
. This property repositions the child element to fit into the center of the parent element.
HTML CODE:
<html>
<body>
<div class="parent-element">
<div class="child-element">Center text!</div>
</div>
</body>
</html>
CSS CODE:
.parent-element {
position: relative;
height: 50vh;
border: 1px solid black;
}
.child-element {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
Example 2
We can vertically align items only using the CSS
properties position: relative
and position; absolute
and transform: translateY(-50%)
,
We will update the CSS
code of the first example to show this:
CSS CODE:
.parent-element {
position: relative;
height: 50vh;
border: 1px solid black;
}
.child-element {
position: absolute;
top: 50%;
transform: translateY(-50%);
}
Vertical alignment using line-height
The line-height
CSS
property specifies the height of a line box. It's widely used to specify the spacing between lines of text. On block-level elements, it sets the minimum height of line boxes within them. On non-replaced inline items, it defines the height used to compute the line box height.
We will give examples on how to use the line-height property to vertically align contents.
Example:
Using the CSS
properties line-height: [lineheight value]
and height: [height value]
, You can vertically align HTML
contents to the center. However this is possible only when the following conditions are met:
- The parent element should have a specified
height
. - The child element must have the
line-height
property. - The
height
of the parent element must be equal to theline-height
of the child element.
HTML CODE:
<html>
<body>
<div class="parent-element">
<div class="child-element">Center text!</div>
</div>
</body>
</html>
CSS CODE:
.parent-element {
height: 100px;
background-color: #333;
}
.child-element {
line-height: 100px;
padding: 0 10px;
color: #fff;
text-decoration: none;
text-align: center;
}
Vertical alignment using inline display (display: inline) and vertical-align: middle
The CSS's
vertical-align
attribute specifies how elements on a line are aligned. This property works to aligning inline
elements only (and not block
elements).
Example:
In this example, with the inline
display and the vertical-align
property, You can vertically align contents to the center. However this is possible only when the following conditions are met:
- The parent element should have a specified
line-height
. We do this to increase the line box so that thevertical-align
property uses to align the contents in the middle of that line-box. - The child element must have the
vertical-align
property.
HTML CODE:
<html>
<body>
<div>
<a href="#">Some link</a>
<span>Some text</span>
</div>
</body>
</html>
CSS CODE:
div {
background: #fff;
margin: 10px;
line-height: 200px;
border: 1px solid #000;
}
div > * {
vertical-align: middle;
line-height: normal;
}
a {
background-color: red;
color: white;
height: 20px;
border: solid 1px #666;
padding: 5px;
}
Vertical alignment using inline-block display (display: inline-block) and vertical-align: middle
In this example, with the inline-block
display and the vertical-align
property, You can vertically align contents to the center.
Example:
HTML CODE:
<html>
<body>
<div class="parent-element">
vertical align middle:
<div class="child-element"></div>
</div>
</body>
</html>
CSS CODE:
.parent-element {
padding: 30px 10px;
border: 1px solid;
}
.child-element {
vertical-align: middle;
display: inline-block;
background: fuchsia;
width: 30px;
height: 30px;
border-radius: 50%;
}
Vertical Alignment using “before” pseudo-element and vertical-align: middle
This type of alignment is usually called the ghost element alignment. This alignment employs using the inline-block
display property on a ghost (pseudo
) element of the parent element, inherits the parent's element full height, then sets the vertical-align: middle
property for both thepseudo-element
of the parent element and the child element.
Example:
HTML CODE:
<html>
<body>
<div class="parent-element">
<p>Child of parent element with pseudo ghost element</p>
</div>
</body>
</html>
CSS CODE:
.parent-element {
background: #fff;
width: 240px;
height: 200px;
margin: 15px;
color: #fff;
resize: vertical;
overflow: auto;
padding: 20px;
border: 1px solid #000;
position: relative;
}
.parent-element::before {
content: " ";
display: inline-block;
height: 100%;
width: 1%;
vertical-align: middle;
}
.parent-element p {
display: inline-block;
vertical-align: middle;
width: 190px;
margin: 0;
padding: 10px;
background: #83d483;
}
Conclusion
In this article, we examined some CSS techniques for vertical alignment of contents. Using these techniques will make it easy to align contents vertically on your webpages or web applications.