The combination of various background patterns and varying levels of color transparency

Trying to solve a problem here.

I have a basic website with a repeating pattern background, and I'm attempting to create a color overlay using multiple backgrounds in CSS. Here's the code I'm using:

html,body {
background: 
rgba(200, 54, 54, 0.5),
url(../img/background.png) repeat;
}

But when I implement this code, all I get is a blank white screen. If I switch the background positions and place the image on top, then I can see the image displayed without the color overlay.

Did I overlook something regarding how this should work? Is it possible that it doesn't function properly on the html,body elements?

Any assistance would be greatly valued. Thank you, Nick

htmlcss

Answer №1

rgba() represents a color value. In CSS, only the last background layer can have a color value; specifying a color on any other layers will result in invalid syntax.1

If you want to add a semi-transparent color overlay to a background image, one workaround is to create an image of that color and overlay it instead. For applying a page background, you can simply apply the color overlay to body and the image to html:

html {
    height: 100%;
    background: url(../img/background.png) repeat;
}

body {
    min-height: 100%;
    background: rgba(200, 54, 54, 0.5);
}

Ensure that the body element covers the entire area of the html element to avoid partial overlay of the background image by the color. The height and min-height styles given above take care of this for height; for width, ensure that body does not have side margins or a width less than 100%.

For more information on setting backgrounds for html and body, refer to this answer.

1 The restriction on having colors only in the bottom layer might seem puzzling considering the existence of color values with alpha channels. Using an image with the same alpha channels as a workaround still requires the browser to composite the background. However, this limitation remains in place even in Backgrounds level 4, so it seems unlikely to change anytime soon.

Answer №2

A cool tip is to create a gradient effect using CSS:

html,body {
    background: linear-gradient(90deg, rgba(100, 200, 150, 0.7) 0%, rgba(100, 200, 150, 0.7) 100%), url(../img/background.png) repeat;
}

Simply input your desired color values for the gradient!

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