Creating a CSS background that adjusts to fit any screen resolution

Hey there, I'm a beginner to all of this. I want my background image to adjust to fit any web browser resolution, regardless of the size. So far, I've come across this nifty little trick:

html { 
  background: url(images/bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

But here's the catch - it only makes the background fit the full size of the display, not the actual browser window. If the display is 1366x768 and the browser is maximized, then the background looks great. However, if I resize the browser window, the background image doesn't adjust correctly.

So, what do I need to do to make sure the background image adjusts along with the browser window? For example, if the browser is 1300x700, the background should be 1300x700. And if the browser is 900x600, then the background image should also be 900x600. As I mentioned before, I'm still learning so some examples would be greatly appreciated.

cssbrowserbackgroundresolutionadjustment

Answer №1

optimize This term indicates that the background image should be adjusted to minimize its size while ensuring it covers the entire background positioning area.

expand On the other hand, this word signifies that the background image should be enlarged to fill as much of the background positioning area as possible without overflowing its dimensions. So, consider using expand instead of optimize.

100% By setting this value, the image will scale proportionally to occupy 100% of both height and width without any truncation.

html { 
  background: url(images/bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: expand;
  -moz-background-size: expand;
  -o-background-size: expand;
  background-size: expand;
}

You can find more information here: http://www.w3schools.com/cssref/playit.asp?filename=playcss_background-size&preval=expand

Additionally, check out this resource for further details: https://developer.mozilla.org/en-US/docs/Web/CSS/background-size

Answer №2

If you want to work around this issue, one solution is to add the background image you desire with specified height and width attributes, then set the width to 100%. After that, you can overlay your content on top of the image.

<div class="container">
    <img class="background-image" src="yourimage.png" width="NATURAL WIDTH" height="NATURAL HEIGHT">
    <div class="content">
        This content will appear over the image.
    </div>
</div>

<style>
    /* This element will match the height of the image */
    .container {
        position: relative;
    }

    /* This element represents the background image */
    .background-image {
        width: 100%;
        height: auto;
        position: static;
    }

    /* This element holds the content which will be positioned above the background image */
    .content {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        z-index: 1;
    }
</style>

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