CodePen Embed - jOrOgRw

<div class="mask">
<div class="box">HELLO ДЯДЯ</div>

</div>
<section></section>
<section></section>

.mask {
  position:fixed;
   mix-blend-mode: exclusion;
}
.box {
  font-size: 40px;
  font-weight: bold;
  width: 200px;
  height: 100px;
  background: yellow;
}
section {
  background: #0080007d;
  height: 100vh;
}
section:nth-child(3) {
  background: #0c62ff;
}

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