Merhabalar,

Style css olan kodda problem var,çalışmıyor.

Koda bakabilirsiniz. https://codepen.io/zitrusfrisch/pen/DbwjOR buradan da bakabilirsiniz.

body {
  font: 400 1em/1.5 "Neuton";
  background: #090d00;
  color: rgba(255, 255, 255, 0.25);
  text-align: center;
  margin: 0;
}

p {
  text-transform: uppercase;
  letter-spacing: 0.5em;
  display: inline-block;
  border: 4px double rgba(255, 255, 255, 0.25);
  border-width: 4px 0;
  padding: 1.5em 0em;
  position: absolute;
  top: 18%;
  left: 50%;
  width: 40em;
  margin: 0 0 0 -20em;

  span {
    font: 700 4em/1 "Oswald", sans-serif;
    letter-spacing: 0;
    padding: 0.25em 0 0.325em;
    display: block;
    margin: 0 auto;
    text-shadow: 0 0 80px rgba(255, 255, 255, 0.5);

    /* Clip Background Image */

    background: url([url]https://i.ibb.co/RDTnNrT/animated-text-fill.png[/url]) repeat-y;
    -webkit-background-clip: text;
    background-clip: text;

    /* Animate Background Image */

    -webkit-text-fill-color: transparent;
    -webkit-animation: aitf 80s linear infinite;

    /* Activate hardware acceleration for smoother animations */

    -webkit-transform: translate3d(0, 0, 0);
    -webkit-backface-visibility: hidden;
  }
}

/* Animate Background Image */

@-webkit-keyframes aitf {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 100% 50%;
  }
}