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HTML 

              
                <div class="bard">
  <div class="strip" style="
    --glitch-x-1: -2em;
    --glitch-hue-1: -16deg;
    --glitch-x-2: 2em;
    --glitch-hue-2: 13deg;

    background-position: 0 -0em;
    height: 5em; 
    animation-name: glitch-9;
    animation-duration: 9000ms; 
    animation-delay: 2s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -1em;
    --glitch-hue-1: -42deg;
    --glitch-x-2: -6em;
    --glitch-hue-2: -23deg;

    background-position: 0 -5em;
    height: 3em; 
    animation-name: glitch-5;
    animation-duration: 5000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -10em;
    --glitch-hue-1: -42deg;
    --glitch-x-2: -9em;
    --glitch-hue-2: 45deg;

    background-position: 0 -8em;
    height: 3em; 
    animation-name: glitch-7;
    animation-duration: 7000ms; 
    animation-delay: 0s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -6em;
    --glitch-hue-1: -11deg;
    --glitch-x-2: 2em;
    --glitch-hue-2: 29deg;

    background-position: 0 -11em;
    height: 5em; 
    animation-name: glitch-8;
    animation-duration: 8000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: 0em;
    --glitch-hue-1: 42deg;
    --glitch-x-2: 2em;
    --glitch-hue-2: -28deg;

    background-position: 0 -16em;
    height: 5em; 
    animation-name: glitch-6;
    animation-duration: 6000ms; 
    animation-delay: 0s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -3em;
    --glitch-hue-1: -45deg;
    --glitch-x-2: -5em;
    --glitch-hue-2: -15deg;

    background-position: 0 -21em;
    height: 2em; 
    animation-name: glitch-7;
    animation-duration: 7000ms; 
    animation-delay: 0s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -5em;
    --glitch-hue-1: 35deg;
    --glitch-x-2: 9em;
    --glitch-hue-2: 35deg;

    background-position: 0 -23em;
    height: 2em; 
    animation-name: glitch-6;
    animation-duration: 6000ms; 
    animation-delay: 0s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: 10em;
    --glitch-hue-1: 39deg;
    --glitch-x-2: -8em;
    --glitch-hue-2: 24deg;

    background-position: 0 -25em;
    height: 6em; 
    animation-name: glitch-7;
    animation-duration: 7000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -6em;
    --glitch-hue-1: -46deg;
    --glitch-x-2: -3em;
    --glitch-hue-2: 18deg;

    background-position: 0 -31em;
    height: 6em; 
    animation-name: glitch-10;
    animation-duration: 10000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -8em;
    --glitch-hue-1: -37deg;
    --glitch-x-2: -6em;
    --glitch-hue-2: 15deg;

    background-position: 0 -37em;
    height: 1em; 
    animation-name: glitch-9;
    animation-duration: 9000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -1em;
    --glitch-hue-1: 16deg;
    --glitch-x-2: 2em;
    --glitch-hue-2: 25deg;

    background-position: 0 -38em;
    height: 2em; 
    animation-name: glitch-5;
    animation-duration: 5000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: 5em;
    --glitch-hue-1: 32deg;
    --glitch-x-2: 10em;
    --glitch-hue-2: -3deg;

    background-position: 0 -40em;
    height: 2em; 
    animation-name: glitch-9;
    animation-duration: 9000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: 10em;
    --glitch-hue-1: -26deg;
    --glitch-x-2: 6em;
    --glitch-hue-2: -45deg;

    background-position: 0 -42em;
    height: 4em; 
    animation-name: glitch-6;
    animation-duration: 6000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -7em;
    --glitch-hue-1: -45deg;
    --glitch-x-2: -8em;
    --glitch-hue-2: 45deg;

    background-position: 0 -46em;
    height: 3em; 
    animation-name: glitch-5;
    animation-duration: 5000ms; 
    animation-delay: 2s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: 4em;
    --glitch-hue-1: 40deg;
    --glitch-x-2: -8em;
    --glitch-hue-2: 29deg;

    background-position: 0 -49em;
    height: 3em; 
    animation-name: glitch-6;
    animation-duration: 6000ms; 
    animation-delay: 1s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: -4em;
    --glitch-hue-1: 26deg;
    --glitch-x-2: -6em;
    --glitch-hue-2: -3deg;

    background-position: 0 -52em;
    height: 6em; 
    animation-name: glitch-10;
    animation-duration: 10000ms; 
    animation-delay: 0s;
  "></div>

  <div class="strip" style="
    --glitch-x-1: 6em;
    --glitch-hue-1: 43deg;
    --glitch-x-2: -1em;
    --glitch-hue-2: -1deg;

    background-position: 0 -58em;
    height: 4em; 
    animation-name: glitch-8;
    animation-duration: 8000ms; 
    animation-delay: 0s;
  "></div>
</div>

<p>
  The effect itself is CSS-only, although styles are generated by JavaScript. Feel free to check the JavaScript code, but you'll see it is commented out.
</p>
<p>
  For details read the <a target="_parent" href="https://muffinman.io/blog/css-image-glitch/">blog post</a>.
</p>

<div class="debug">
  <div class="code"></div>
</div>
!

CSS 

              
                body {
  background: #0d0a14;
  padding: 40px 20px;
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas,
    "DejaVu Sans Mono", monospace;
  color: #9d9aa4;
}

.bard {
  margin: 0 auto 40px;
  width: 65em;
  height: 62em;
  font-size: 2px;

  @media (min-width: 360px) {
    font-size: 3px;
  }

  @media (min-width: 600px) {
    font-size: 4px;
  }

  @media (min-width: 1000px) {
    font-size: 5px;
  }
}

.bard img {
  width: 100%;
  height: auto;
  position: absolute;
  left: 0;
  top: 0;
}

.strip {
  overflow: hidden;
  position: relative;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-timing-function: linear;
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
  background-size: 100% auto;
  // base64 encoded image
  background-image: url(data:image/gif;base64,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);
}

@keyframes glitch-5 {
  0.00%,
  33.33%,
  43.33%,
  66.67%,
  76.67%,
  100.00% {
    transform: none;
    filter: hue-rotate(0) drop-shadow(0 0 0 transparent);
  }

  33.43%,
  43.23% {
    transform: translateX(var(--glitch-x-1));
    filter: hue-rotate(var(--glitch-hue-1))
      drop-shadow(0px -4px 0 rgb(0 0 255 / 0.1));
  }

  66.77%,
  76.57% {
    transform: translateX(var(--glitch-x-2));
    filter: hue-rotate(var(--glitch-hue-2))
      drop-shadow(-1px 0px 0 rgb(255 0 0 / 0.1));
  }
}

@keyframes glitch-6 {
  0.00%,
  33.33%,
  41.67%,
  66.67%,
  75.00%,
  100.00% {
    transform: none;
    filter: hue-rotate(0) drop-shadow(0 0 0 transparent);
  }

  33.43%,
  41.57% {
    transform: translateX(var(--glitch-x-1));
    filter: hue-rotate(var(--glitch-hue-1))
      drop-shadow(-2px 3px 0 rgb(255 0 0 / 0.1));
  }

  66.77%,
  74.90% {
    transform: translateX(var(--glitch-x-2));
    filter: hue-rotate(var(--glitch-hue-2))
      drop-shadow(-3px -2px 0 rgb(0 0 255 / 0.1));
  }
}

@keyframes glitch-7 {
  0.00%,
  33.33%,
  40.48%,
  66.67%,
  73.81%,
  100.00% {
    transform: none;
    filter: hue-rotate(0) drop-shadow(0 0 0 transparent);
  }

  33.43%,
  40.38% {
    transform: translateX(var(--glitch-x-1));
    filter: hue-rotate(var(--glitch-hue-1))
      drop-shadow(0px -3px 0 rgb(0 0 255 / 0.1));
  }

  66.77%,
  73.71% {
    transform: translateX(var(--glitch-x-2));
    filter: hue-rotate(var(--glitch-hue-2))
      drop-shadow(4px 1px 0 rgb(255 0 0 / 0.1));
  }
}

@keyframes glitch-8 {
  0.00%,
  33.33%,
  39.58%,
  66.67%,
  72.92%,
  100.00% {
    transform: none;
    filter: hue-rotate(0) drop-shadow(0 0 0 transparent);
  }

  33.43%,
  39.48% {
    transform: translateX(var(--glitch-x-1));
    filter: hue-rotate(var(--glitch-hue-1))
      drop-shadow(-1px -1px 0 rgb(0 0 255 / 0.1));
  }

  66.77%,
  72.82% {
    transform: translateX(var(--glitch-x-2));
    filter: hue-rotate(var(--glitch-hue-2))
      drop-shadow(3px -1px 0 rgb(0 0 255 / 0.1));
  }
}

@keyframes glitch-9 {
  0.00%,
  33.33%,
  38.89%,
  66.67%,
  72.22%,
  100.00% {
    transform: none;
    filter: hue-rotate(0) drop-shadow(0 0 0 transparent);
  }

  33.43%,
  38.79% {
    transform: translateX(var(--glitch-x-1));
    filter: hue-rotate(var(--glitch-hue-1))
      drop-shadow(1px -3px 0 rgb(255 0 0 / 0.1));
  }

  66.77%,
  72.12% {
    transform: translateX(var(--glitch-x-2));
    filter: hue-rotate(var(--glitch-hue-2))
      drop-shadow(1px 1px 0 rgb(255 0 0 / 0.1));
  }
}

@keyframes glitch-10 {
  0.00%,
  33.33%,
  38.33%,
  66.67%,
  71.67%,
  100.00% {
    transform: none;
    filter: hue-rotate(0) drop-shadow(0 0 0 transparent);
  }

  33.43%,
  38.23% {
    transform: translateX(var(--glitch-x-1));
    filter: hue-rotate(var(--glitch-hue-1))
      drop-shadow(3px -1px 0 rgb(255 0 0 / 0.1));
  }

  66.77%,
  71.57% {
    transform: translateX(var(--glitch-x-2));
    filter: hue-rotate(var(--glitch-hue-2))
      drop-shadow(-3px 2px 0 rgb(255 0 0 / 0.1));
  }
}

// ----- Debug ----- //

p {
  margin: 20px auto 0;
  position: relative;
  max-width: 400px;
  text-align: center;
  line-height: 1.3;
  font-size: 0.875rem;
}

a {
  color: #6be1e9;
}

a:focus,
a:hover,
a:visited {
  opacity: 0.8;
}

a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

.debug {
  margin: 40px auto 0;
  position: relative;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 100%;
}

.code {
  margin: 10px auto 0;

  @media (min-width: 600px) {
    display: flex;
    gap: 32px;
    justify-content: center;
    align-items: flex-start;
  }
}

.heading {
  margin: 0 0 10px;
  font-size: 1.5rem;
  font-weight: bold;
}

.column {
  border: 1px solid rgb(255 255 255 / 0.1);
  padding: 10px;
  border-radius: 4px;
  color: #e8c57d;
}

.column + .column {
  color: #aa95bd;
}
!

JS 

              
                const random = (min: number, max: number): number => {
  return Math.round(Math.random() * (max - min)) + min;
};

const getKeyFrames = (
  name: string,
  glitchPercentageDuration: number,
  steps: number = 3,
  tick: number = 0.1
): string => {
  const percentageStep = 100 / steps;

  const keyframes: {
    keys: number[];
    css: Record<string, string | number>;
  }[] = [];

  // First keyframe
  const baseKeys = [0];

  for (let i = 1; i < steps; i++) {
    const p = i * percentageStep;
    baseKeys.push(p);
    baseKeys.push(p + glitchPercentageDuration);
  }

  // Last keyframe
  baseKeys.push(100);

  keyframes.push({
    keys: baseKeys,
    css: {
      transform: "none",
      filter: "hue-rotate(0) drop-shadow(0 0 0 transparent)" // Hack to force animation in Safari
    }
  });

  for (let i = 1; i < steps; i++) {
    const p = i * percentageStep;

    // Blue / red shadow
    const color =
      Math.random() > 0.5 ? "rgb(255 0 0 / 0.1)" : "rgb(0 0 255 / 0.1)";
    const shadowX = random(-4, 4);
    const shadowY = random(-4, 4);

    keyframes.push({
      keys: [p + tick, p + glitchPercentageDuration - tick],
      css: {
        transform: `translateX(var(--glitch-x-${i}))`,
        filter: `hue-rotate(var(--glitch-hue-${i})) drop-shadow(${shadowX}px ${shadowY}px 0 ${color})`
      }
    });
  }

  const css = keyframes
    .map((keyframe) => {
      const keys = keyframe.keys
        .map((key) => `${key.toFixed(2)}%`)
        .join(",\n  ");

      const content = Object.entries(keyframe.css)
        .map(([key, value]) => `  ${key}: ${value};`)
        .join("\n  ");

      return [keys, "{", content, "}"].join("\n  ");
    })
    .join("\n\n  ");

  return `@keyframes ${name} {\n  ${css}\n}`;
};

const getStripHTML = (top: number, stripHeight: number): string => {
  const duration = random(5, 10);
  const name = `glitch-${duration}`;

  return `<div 
  class="strip" 
  style="
    --glitch-x-1: ${random(-10, 10)}em;
    --glitch-hue-1: ${random(-50, 50)}deg;
    --glitch-x-2: ${random(-10, 10)}em;
    --glitch-hue-2: ${random(-50, 50)}deg;

    background-position: 0 -${top}em;
    height: ${stripHeight}em; 
    animation-name: ${name};
    animation-duration: ${duration * 1000}ms; 
    animation-delay: ${random(0, 2)}s;
  "
></div>`;
};

const getGlitchHTML = (height: number): string[] => {
  let i = 0;
  const html: string[] = [];

  while (1) {
    const stripHeight = random(1, 6);

    if (i + stripHeight < height) {
      const strip = getStripHTML(i, stripHeight);
      html.push(strip);
    } else {
      // Last strip
      const strip = getStripHTML(i, height - i);
      html.push(strip);
      break;
    }

    i = i + stripHeight;
  }

  return html;
};

/*

If you want to generate new CSS/HTML dinamically,
uncomment the code below.

*/

// const html = getGlitchHTML(62);

// // HTML
// const $glitch = document.querySelector(".bard") as HTMLElement;
// $glitch.innerHTML = html.join("\n");

// // CSS
// const css = [5,6,7,8,9,10].map((n) => {
//   const glitchDurationMS = 500;
//   const glitchPercentageDuration = (glitchDurationMS * 100) / (n * 1000);

//   return getKeyFrames(`glitch-${n}`, glitchPercentageDuration);
// });

// // Add generated CSS to the page
// const $style = document.createElement("style");
// $style.innerHTML = css.join("\n");
// document.head.appendChild($style);

// // ----- Debug -------------- //
// // Not used for the animation //

// const $code = document.querySelector(".code");

// const escape = (html) => {
//   return html
//     .replace(/&/g, "&amp;")
//     .replace(/</g, "&lt;")
//     .replace(/>/g, "&gt;")
//     .replace(/"/g, "&quot;")
//     .replace(/'/g, "&#039;");
// };

// $code.innerHTML = `
//   <div class="column">
//     <div class="heading">HTML</div>
//     <pre>${escape(html.join("\n\n"))}</pre>
//   </div>

//   <div class="column">
//     <div class="heading">CSS</div>
//     <pre>${css.join("\n\n")}</pre>
//   </div>
// `;
!
999px

Console