What is the process for applying a filter to a background image within the body of a webpage?

I'm attempting to apply a filter to the background image of the body element. Currently, I have implemented the following code:

body {
    background: url("/img/congruent_pentagon.png");
    color: white;
    font-family: "Raleway";
    -webkit-filter: grayscale(1);
}

While this code successfully applies the grayscale filter to child elements, it does not affect the background image itself. After researching various methods used by others, I found that most involve manipulating HTML elements rather than applying filters directly to the background image. Is there a way to achieve this effect? If so, how can it be done?

css

Answer №1

It seems like there is a lot of effort involved in this process compared to simply using Photoshop or a similar tool to desaturate the image.

However, if you are interested in using pseudo-element selectors for this task, I have a solution. In my case, I utilized the background property in the pseudo-element :before.

After ensuring that it is appropriately sized and setting a negative value for the z-index to ensure it always appears behind the body content, I applied the grayscale filter.

I believe this method achieves what you were looking for.

body {
margin: 0 auto;
}

body:before {
  background: url("https://unsplash.it/1920/?image=1062") no-repeat center;
  background-size: 100%;
  content: "";
  height: 100vh;
  width: 100vw;
  position: fixed;
  filter: grayscale(1);
  z-index: -1;

}

.content {
  opacity: .6;
  height: 200px;
  width: 200px;
  display: inline-block;
  margin: 1em;
}

/* color fluff */
.aa {background: yellow;}
.bb {background: red;}
.cc {background: green;}
.dd {background: orange;}
<div class="container">
  <div class="content aa"></div>
  <div class="content bb"></div>
  <div class="content cc"></div>
  <div class="content dd"></div>
</div>

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