Adding background blur to an element can make it more visually appealing and it's also REALLY use to do it. So, you might as well add it cuz why not? ¯\_(ツ)_/¯

The line of code you need

backdrop-filter: blur(5px);

Besides that, make sure that the element that will have a blurred background is not a solid color but is a bit transparent. And, ensure that the background of that element is not a solid color either.

Full code / Example

HTML

<h1>Subscribe to Axorax!</h1>

CSS

body {
  background: url("./nature.jpg") no-repeat center center / cover;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100dvh;
  font-family: "arial", sans-serif;
}

h1 {
  padding: 1.5rem;
  border-radius: 10px;
  color: #ffffff;
  /* ↓ Important ↓ */
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(5px);
}

Thanks for reading! Have an amazing day! ✨