#back {
  position: fixed;
  top: 15%;
  left: 0;
  z-index: 99999;
  color: #fff;
  width: 100%;
  text-align: center;
  display: flex;
  justify-content: space-around;
  padding: 1.5rem;
  mix-blend-mode: difference;
}
#back a {
  font-family: monospace;
  color: inherit;
  text-decoration: none;
  font-size: 1rem;
  letter-spacing: 1.5px;
  mix-blend-mode: exclusion;
  width: 33%;
}

#navigation {
  position: fixed;
  top: 0;
  left: 0;
}

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