SVG fill with css variables

Okay here we go... I will first explain why it does not work and then I will show an alternative.

Why your approach doesn't work

In your example the svg is not part of the DOM. So you cannot use css to modify the attributes of the svg.

What you are doing is adding an inline-style to the svg in your url. Since the browser does not recognise --primary-color as a color it doesn't work.

An alternative approach

An alternative approach is to put the svg in the html and fake a background. I did this by absolute positioning the svg and moving it to the background with z-index.

Do note you will have to modify the svg or the positioning to place the background in the way you want. Normally you would use background-size for this. But with some effort you can replicate this behaviour within the svg or position it better by using css.

:root {
  --primary-color: hsl(332, 61%, 78%);
}

div {
  width: 100px;
  height: 100px; 
}

.test {
  background: var(--primary-color);
}
.icon{ /*postion relative for absolute positioning to work*/
  position: relative; 
}
.icon>svg{
  position: absolute;
  top: 0px;
  right: 0px;
  left: 0px;
  bottom: 0px;
  z-index: -1;
}
.icon>svg>path{ /*target the image with css*/
  fill: var(--primary-color);
}
<div class="test">
  Testing the css variable color
</div>

<div class="icon">
  <svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 129 129' id='background'><path d='m121.3,34.6c-1.6-1.6-4.2-1.6-5.8,0l-51,51.1-51.1-51.1c-1.6-1.6-4.2-1.6-5.8,0-1.6,1.6-1.6,4.2 0,5.8l53.9,53.9c0.8,0.8 1.8,1.2 2.9,1.2 1,0 2.1-0.4 2.9-1.2l53.9-53.9c1.7-1.6 1.7-4.2 0.1-5.8z'/> </svg>
  <p>Text goes here...</p>
</div>

Don't include svg as background, by doing that you don't have control over it's fill, instead try adding it inline in html and via css you can control the fill via css variable, please check the working example below, hope it helps :)

:root {
  --primary-color: hsl(332, 61%, 78%);
}

div {
  width: 100px;
  height: 100px;
}

.test {
  background: var(--primary-color);
}

.icon {
  color: var(--primary-color);
  fill: currentColor;
  width: 64px;
  height: 64px;
}
<div class="test">
  Testing the css variable color
</div>
<svg class="icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 129 129">
  <path d="m121.3,34.6c-1.6-1.6-4.2-1.6-5.8,0l-51,51.1-51.1-51.1c-1.6-1.6-4.2-1.6-5.8,0-1.6,1.6-1.6,4.2 0,5.8l53.9,53.9c0.8,0.8 1.8,1.2 2.9,1.2 1,0 2.1-0.4 2.9-1.2l53.9-53.9c1.7-1.6 1.7-4.2 0.1-5.8z"/>
</svg>

Now you can include SVG as mask-image instead of background. Don't forget set background color from css variables for .icon block.

.icon {
  background: var(--primary-color);
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 129 129'%3E%3Cpath d='m121.3,34.6c-1.6-1.6-4.2-1.6-5.8,0l-51,51.1-51.1-51.1c-1.6-1.6-4.2-1.6-5.8,0-1.6,1.6-1.6,4.2 0,5.8l53.9,53.9c0.8,0.8 1.8,1.2 2.9,1.2 1,0 2.1-0.4 2.9-1.2l53.9-53.9c1.7-1.6 1.7-4.2 0.1-5.8z' /%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 129 129'%3E%3Cpath d='m121.3,34.6c-1.6-1.6-4.2-1.6-5.8,0l-51,51.1-51.1-51.1c-1.6-1.6-4.2-1.6-5.8,0-1.6,1.6-1.6,4.2 0,5.8l53.9,53.9c0.8,0.8 1.8,1.2 2.9,1.2 1,0 2.1-0.4 2.9-1.2l53.9-53.9c1.7-1.6 1.7-4.2 0.1-5.8z' /%3E%3C/svg%3E");
}

You can check it in this CodePan

Here is information from Caniuse about mask-image

And here documentation about mask property

Tags:

Css

Svg

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