Design a blurred glass effect background with a circular spotlight focusing on a specific section of an HTML webpage

I've been attempting to achieve a frosted glass effect on a background, with a circular section unblurred. Unfortunately, my current implementation in the sandbox editor is not working as expected - the area of the circle remains blurred.

If you'd like to take a look at what I have so far, here is the link: https://codesandbox.io/s/frosted-glass-background-with-spotlight-fwdhd. Please note that the sandbox was created using vue 2, but it should be easy to replicate the issue in vanilla JS.

I believe using an HTML canvas tag might solve this problem, but I'm unsure about how to go about implementing it. Can anyone offer some guidance or assistance?

css

Answer №1

To achieve this effect using CSS, you can utilize the mask-image property along with CSS filter.

In the demonstration below, a transparent PNG with a circular mask is used, in combination with the filter property to create a blurred effect on the underlying image.

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 400px;
  height: 300px;
  margin: 1em auto;
  position: relative;
}

.container img {
  height: 100%;
  width: 100%;
  object-fit: cover;
  -webkit-mask-size: cover;
  mask-size: cover;
  position: absolute;
  top: 0;
  left: 0;
}

.container img.overlay {
  filter: blur(10px);
}

.container img.underlay {
  -webkit-mask-image: url(https://i.imgur.com/l4o4AkX.png);
  mask-image: url(https://i.imgur.com/l4o4AkX.png);
  z-index: 2;
}
<div class="container">
  <img class="underlay" src="https://cdn.glitch.com/04eadd2b-7dd4-43fc-af3d-cff948811986%2Fballoons.jpg?v=1597755892826" alt="Balloons">
  <img class="overlay" src="https://cdn.glitch.com/04eadd2b-7dd4-43fc-af3d-cff948811986%2Fballoons.jpg?v=1597755892826" alt="Balloons">
</div>

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