CSS Height and Width

This element has a width of 100%.

<!DOCTYPE html>
<html>
<head>
<style>
div {
    width: 100%;
    border: 1px solid #4CAF50;
}
</style>
</head>


<div>This element has a width of 100%.</div>

</body>
</html>

Setting height and width

The height and width properties are used to set the height and width of an element.
The height and width can be set to auto (this is default. Means that the browser calculates the height and width), or be specified in length values, like px, cm, etc., or in percent (%) of the containing block.
This element has a height of 200 pixels and a width of 50%

Example

div {
    height: 200px;
    width: 50%;
    background-color: powderblue;
}

This element has a height of 100 pixels and a width of 500 pixels.

Example

div {
    height: 100px;
    width: 500px;
    background-color: powderblue;
}

Note: The height and width properties do not include padding, borders, or margins; they set the height/width of the area inside the padding, border, and margin of the element!

Setting max-width

The max-width property is used to set the maximum width of an element.
The max-width can be specified in length values, like px, cm, etc., or in percent (%) of the containing block, or set to none (this is default. Means that there is no maximum width).
The problem with the <div> above occurs when the browser window is smaller than the width of the element (500px). The browser then adds a horizontal scrollbar to the page.
Using max-width instead, in this situation, will improve the browser's handling of small windows.

Tip: Drag the browser window to smaller than 500px wide, to see the difference between the two divs!
This element has a height of 100 pixels and a max-width of 500 pixels
Note: The value of the max-width property overrides width.
The following example shows a <div> element with a height of 100 pixels and a max-width of 500 pixels:

Example

div {
    max-width: 500px;
    height: 100px;
    background-color: powderblue;
}

All CSS Dimension Properties

Property	Description
height	Sets the height of an element
max-height	Sets the maximum height of an element
max-width	Sets the maximum width of an element
min-height	Sets the minimum height of an element
min-width	Sets the minimum width of an element
width	Sets the width of an element

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