Yazıyı responsive hale getirme hk.

.stack {
  display: grid;
  grid-template-columns: 1fr;
}

.stack span {
  font-weight: bold;
  grid-row-start: 1;
  grid-column-start: 1;
  font-size: 10rem;
  --stack-height: calc(100% / var(--stacks) - 1px);
  --inverse-index: calc(calc(var(--stacks) - 1) - var(--index));
  --clip-top: calc(var(--stack-height) * var(--index));
  --clip-bottom: calc(var(--stack-height) * var(--inverse-index));
  clip-path: inset(var(--clip-top) 0 var(--clip-bottom) 0);
  animation: stack 340ms cubic-bezier(.46,.29,0,1.24) 1 backwards calc(var(--index) * 120ms), glitch 750ms ease infinite 750ms alternate-reverse;
}

.stack span:nth-child(odd) { --glitch-translate: 8px; }
.stack span:nth-child(even) { --glitch-translate: -8px; }

@keyframes stack {
  0% {
    opacity: 0;
    transform: translateX(-50%);
    text-shadow: -2px 3px 0 red, 2px -3px 0 blue;
  };
  60% {
    opacity: 0.5;
    transform: translateX(50%);
  }
  80% {
    transform: none;
    opacity: 1;
    text-shadow: 2px -3px 0 red, -2px 3px 0 blue;
  }
  100% {
    text-shadow: none;
  }
}

@keyframes glitch {
  0% {
    text-shadow: -2px 3px 0 red, 2px -3px 0 blue;
    transform: translate(var(--glitch-translate));
  }
  2% {
    text-shadow: 2px -3px 0 red, -2px 3px 0 blue;
  }
  4%, 100% {  text-shadow: none; transform: none; }
}

<div class="container">

  <div class="stack" style="--stacks: 3;">
    <span style="--index: 0;">WE ARE OLDSCHOOL</span>
    <span style="--index: 1;">WE ARE OLDSCHOOL</span>
    <span style="--index: 2;">WE ARE OLDSCHOOL</span>
  </div>
</div>