Html – Set background image to cover according to viewport size

csshtml

With respect to the mentioned subject, I would like to know how to add code that will set the background image size to cover the window completely without the sides getting cut off.
I have tried using height and width auto,cover and 100% but none are working.

Any help is appreciated. Thank you!

Best Answer

Use the CSS background-size property.

If you want your background image to fill the area to the minimum width/height use:

background-size: cover;

If you want your background image to fill the area as large as possible but still show all your image use:

background-size: contain;

Related Solutions

CSS 100% height with padding/margin

I learned how to do these sort of things reading "PRO HTML and CSS Design Patterns". The display:block is the default display value for the div, but I like to make it explicit. The container has to be the right type; position attribute is fixed, relative, or absolute.

.stretchedToMargin {
  display: block;
  position:absolute;
  height:auto;
  bottom:0;
  top:0;
  left:0;
  right:0;
  margin-top:20px;
  margin-bottom:20px;
  margin-right:80px;
  margin-left:80px;
  background-color: green;
}

<div class="stretchedToMargin">
  Hello, world
</div>

Fiddle by Nooshu's comment

Html – When to use IMG vs. CSS background-image

Proper uses of IMG

Use IMG if you intend to have people print your page and you want the image to be included by default. —JayTee
Use IMG (with alt text) when the image has an important semantic meaning, such as a warning icon. This ensures that the meaning of the image can be communicated in all user-agents, including screen readers.

Pragmatic uses of IMG

Use IMG plus alt attribute if the image is part of the content such as a logo or diagram or person (real person, not stock photo people). —sanchothefat
Use IMG if you rely on browser scaling to render an image in proportion to text size.
Use IMG for multiple overlay images in IE6.
~~Use IMG with a z-index in order to stretch a background image to fill its entire window.~~
Note, this is no longer true with CSS3 background-size; see #6 below.
Using img instead of background-image can dramatically improve performance of animations over a background.

When to use CSS background-image

Use CSS background images if the image is not part of the content. —sanchothefat
Use CSS background images when doing image-replacement of text eg. paragraphs/headers. —sanchothefat
Use background-image if you intend to have people print your page and you do not want the image to be included by default. —JayTee
Use background-image if you need to improve download times, as with CSS sprites.
Use background-image if you need for only a portion of the image to be visible, as with CSS sprites.
Use background-image with background-size:cover in order to stretch a background image to fill its entire window.