Using CSS Mix-Blend-Mode with a Child of a Position Fixed Element

CSS position: fixed + mix-blend-mode: difference issue

I have fixed that issue:

<div class="fixed_menu">
    <div class="nav-bar">
      <nav>
        <ul>
          <li class="test">
            <img src="./img/logo_nav.svg" alt="logo" />
          </li>
          <li>
            <div class="line"></div>
            <div class="line"></div>
            <div class="line"></div>
          </li>
        </ul>
      </nav>
    </div>
  </div>

  <div class="section section1">
    <div class="headline-container">
      <div class="headline-item">
        <span>W</span>
        <span>E</span>
        <span>B</span>
        <span>A</span>
        <span>P</span>
        <span>P</span>
        <span>L</span>
        <span>I</span>
        <span>C</span>
        <span>A</span>
        <span>T</span>
        <span>I</span>
        <span>O</span>
        <span>N</span>
      </div>
      <div class="headline-item">
        <span>D</span>
        <span>E</span>
        <span>S</span>
        <span>I</span>
        <span>G</span>
        <span>N</span>
      </div>
      <div class="headline-item">
        <span>B</span>
        <span>R</span>
        <span>A</span>
        <span>N</span>
        <span>D</span>
        <span>I</span>
        <span>N</span>
        <span>G</span>
      </div>
      <div class="headline-item">
        <span>C</span>
        <span>O</span>
        <span>M</span>
        <span>M</span>
        <span>U</span>
        <span>N</span>
        <span>I</span>
        <span>C</span>
        <span>A</span>
        <span>T</span>
        <span>I</span>
        <span>O</span>
        <span>N</span>
      </div>
    </div>
  </div>
</div>

* {
 margin: 0;
 padding: 0;
 box-sizing: border-box;
}

.section {
 background-color: white;
}

.section1 h1 {
 padding-top: 150px;
 text-align: center;
}

.fixed_menu {
 position: fixed;
 width: calc(100vw - 3rem);
 mix-blend-mode: difference;
 z-index: 2;
 left: 50%;
 top: 30px;
 transform: translateX(-50%);
}

.nav-bar {
 width: calc(100vw - 3rem);
 /* margin: 0 auto; */
}

.nav-bar ul {
 display: flex;
 justify-content: space-between;
 top: 200px;
}

.nav-bar ul li {
 list-style: none;
}

.nav-bar ul li img {
 width: 30px;
}

.nav-bar ul li .line {
 width: 25px;
 height: 5px;
 background: #fff;
 margin-bottom: 3px;
}

.nav-bar ul li .line:last-child {
 margin-bottom: 0;
}

.headline-container {
 padding-top: 100px;
}

.headline-container .headline-item {
 width: calc(100vw - 3rem);
 margin: 0 auto;
 display: flex;
 justify-content: space-between;
}

.headline-container .headline-item span {
 font-size: 7vw;
 font-family: 'Montserrat', sans-serif;
 font-style: italic;
 font-weight: bold;
 mix-blend-mode: difference;
 color: white;
}

I dont know exactly what happened, but since I restructured everything, and used CSS instead of SCSS, i guess i had somewhere a typo, or something like that

mix-blend-mode sticky position

for the mix-blend-mode to work apply it like this

body {
            height: 150vh;
            background: #000;
          }
          
          h1 {
        
            color: rgb(255, 255, 255);
            z-index: 2;
            
          }
          
          .top {
            mix-blend-mode: difference;
            position: sticky;
            top: 0;
            height: 50vh;
          z-index: 1;
          
          }
          
          .bottom {
            background: rgb(232, 12, 12);
            position: sticky;
            top: 0;
            height: 50vh;
            position: relative;
            isolation: isolate;
          }

<div>
        <div class="top">
          <h1>Hello World</h1>
        </div>
        <div class="bottom"></div>
      </div>

Mix-blend-mode not affecting any component

did you want something like this?

html {
  scroll-behavior: smooth;
  background: #fff;
}

body {
  margin: 0;
  padding: 0;
  width: 100%;
  max-width: 100%;

  background-color: #ffffff;
  color: #0d0d0d;
}

/**********************************************/

.section {
  width: 100vw;
  max-width: 100%;
  background-color: #ffffff;
  text-align: center;

  margin: 0;
  padding: 15vh 0;
  position: relative;
}

.blk {
  background-color: #0d0d0d;
  color: #ffffff;
}

/**********************************************/

.sidenav {
  width: auto;
  position: fixed;
  z-index: 1;
  top: 150px;
  padding: 8px 0;
  mix-blend-mode: difference;
}

.sidenav a {
  clear: both;
  float: left;
  position: relative;
  left: -20%;
  padding: 10px;
  margin-bottom: 15px;
  transition: 0.3s;

  text-decoration: none;
  text-align: right;
  font-size: 24px;

  border-style: solid;
  border-width: 2px;
  border-color: #fff;
  border-radius: 0 5px 5px 0;

  color: #fff;
  background-color: #000;

}

.sidenav a:hover {
  left: -2px;
}

.sidenav a.selected {
  left: -2px;
  color: #000;
  background-color: #fff;
  cursor: default;
}

<!doctype html>
<html>
<head></head>

  <body>

    <div class="sidenav">
      <a href="#" class="selected">  Section 1</a>
      <a href="#">  Another Section</a>
      <a href="#">  Last One</a>
    </div>

    <div class="content" onclick="closeMenu()">
      <div class="section" id="works">
        <p>Some text<p>
      </div>
      <div class="section blk" id="works">
        <p>Some text<p>
      </div>
      <div class="section" id="works">
        <p>Some text<p>
      </div>
      <div class="section blk" id="works">
        <p>Some text<p>
      </div>
      <div class="section" id="works">
        <p>Some text<p>
      </div>
    </div>
  </body>
</html>

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