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Custom Text Highlighting with CSS

reime005 profile image Marius Reimer ・1 min read

img

Some websites do different things to highlight specific text phrases. This could be text that the user should pay attention at (like a warning), or is just very important (like an item price). I was curious on how to do that.

The solution is very simple: via CSS, background image and inline span. First, you need to create the image that you want to put as a highlight behind your text. I just used Gimp and a brush tool until I was okay with the result. The image has to be exported as a scalable vector graphic (svg).

<!DOCTYPE html>
<html lang="en">
  <head>
    <link href="https://fonts.googleapis.com/css2?family=Baloo+Bhaina+2:wght@600&display=swap" rel="stylesheet">
    <style type="text/css">
      body {
        font-family: 'Baloo Bhaina 2', cursive;
        background-color: #fffdf8;
      }
      .highlighted-text {
        background-image: url('data:image/svg+xml;base64,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');
        background-position: 50% 50%;
        padding-left: 20px;
        padding-right: 20px;
        padding-top: 5px;
        background-repeat: no-repeat;
        background-size: cover;
      }
    </style>
  </head>
  <body>
    <p>This is a <span class="highlighted-text">special</span> title</p>
  </body>
</html>

After the image is created, you could either keep it as a file or convert it to a base64 string to be used within css. Important is, that the background-image resizes by covering the element, does not repeat and is centred.

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