Efecto de borde eléctrico azul CSS

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Blue Electric Border</title>
  <style>
    /* Reset and base styles */

/* CSS Variables */
    :root {
      --border-color: #4a9eff;
      --light-color: oklch(from var(--border-color) l c h);
      --gradient-color: oklch(
        from var(--border-color) 0.3 calc(c / 2) h / 0.4
      );
      --neutral-900: oklch(0.185 0 0);
    }

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

body {
      font-family: system-ui, -apple-system, sans-serif;
      background-color: oklch(0.145 0 0);
      color: oklch(0.985 0 0);
      height: 100vh;
      overflow: hidden;
    }

/* Main container */
    .container {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
    }

/* SVG positioning */
    .svg {
      position: absolute;
    }

/* Card container */
    .card {
      padding: 2px;
      border-radius: 24px;
      position: relative;
      background: linear-gradient(
          -30deg,
          var(--gradient-color),
          transparent,
          var(--gradient-color)
        ),
        linear-gradient(
          to bottom,
          var(--neutral-900),
          var(--neutral-900)
        );
    }

/* Inner container */
    .inner {
      position: relative;
    }

/* Border layers */
    .border {
      border: 2px solid rgba(74, 158, 255, 0.5);
      border-radius: 24px;
      padding-right: 4px;
      padding-bottom: 4px;
    }

.main {
      width: 350px;
      height: 500px;
      border-radius: 24px;
      border: 2px solid var(--border-color);
      margin-top: -4px;
      margin-left: -4px;
      filter: url(#turbulent-displace);
    }

/* Glow effects */
    .glow-1 {
      border: 2px solid rgba(74, 158, 255, 0.6);
      border-radius: 24px;
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      filter: blur(1px);
    }

.glow-2 {
      border: 2px solid var(--light-color);
      border-radius: 24px;
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      filter: blur(4px);
    }

/* Overlay effects */
    .overlay-1 {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      border-radius: 24px;
      opacity: 1;
      mix-blend-mode: overlay;
      transform: scale(1.1);
      filter: blur(16px);
      background: linear-gradient(
        -30deg,
        white,
        transparent 30%,
        transparent 70%,
        white
      );
    }

.overlay-2 {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      border-radius: 24px;
      opacity: 0.5;
      mix-blend-mode: overlay;
      transform: scale(1.1);
      filter: blur(16px);
      background: linear-gradient(
        -30deg,
        white,
        transparent 30%,
        transparent 70%,
        white
      );
    }

/* Background glow */
    .bg-glow {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      border-radius: 24px;
      filter: blur(32px);
      transform: scale(1.1);
      opacity: 0.3;
      z-index: -1;
      background: linear-gradient(
        -30deg,
        var(--light-color),
        transparent,
        var(--border-color)
      );
    }

/* Content container */
    .content {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      width: 100%;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

/* Content sections */
    .top {
      display: flex;
      flex-direction: column;
      padding: 48px;
      padding-bottom: 16px;
      height: 100%;
    }

.bottom {
      display: flex;
      flex-direction: column;
      padding: 48px;
      padding-top: 16px;
    }

/* Scrollbar glass component */
    .glass {
      background: radial-gradient(
          47.2% 50% at 50.39% 88.37%,
          rgba(255, 255, 255, 0.12) 0%,
          rgba(255, 255, 255, 0) 100%
        ),
        rgba(255, 255, 255, 0.04);
      position: relative;
      transition: background 0.3s ease;
      border-radius: 14px;
      width: fit-content;
      height: fit-content;
      padding: 8px 16px;
      text-transform: uppercase;
      font-weight: bold;
      font-size: 14px;
      color: rgba(255, 255, 255, 0.8);
    }

.glass:hover {
      background: radial-gradient(
          47.2% 50% at 50.39% 88.37%,
          rgba(255, 255, 255, 0.12) 0%,
          rgba(255, 255, 255, 0) 100%
        ),
        rgba(255, 255, 255, 0.08);
    }

.glass::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      padding: 1px;
      background: linear-gradient(
        150deg,
        rgba(255, 255, 255, 0.48) 16.73%,
        rgba(255, 255, 255, 0.08) 30.2%,
        rgba(255, 255, 255, 0.08) 68.2%,
        rgba(255, 255, 255, 0.6) 81.89%
      );
      border-radius: inherit;
      mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      mask-composite: xor;
      -webkit-mask-composite: xor;
      pointer-events: none;
    }

/* Typography */
    .title {
      font-size: 36px;
      font-weight: 500;
      margin-top: auto;
    }

.description {
      opacity: 0.5;
    }

/* Divider */
    .divider {
      margin-top: auto;
      border: none;
      height: 1px;
      background-color: currentColor;
      opacity: 0.1;
      mask-image: linear-gradient(to right, transparent, black, transparent);
      -webkit-mask-image: linear-gradient(
        to right,
        transparent,
        black,
        transparent
      );
    }
  </style>
</head>
<body>
  <main class="container">
    <svg class="svg">
      <defs>
        <filter id="turbulent-displace" colorInterpolationFilters="sRGB" x="-20%" y="-20%" width="140%" height="140%">
          <feTurbulence type="turbulence" baseFrequency="0.02" numOctaves="10" result="noise1" seed="1" />
          <feOffset in="noise1" dx="0" dy="0" result="offsetNoise1">
            <animate attributeName="dy" values="700; 0" dur="6s" repeatCount="indefinite" calcMode="linear" />
          </feOffset>
          <feTurbulence type="turbulence" baseFrequency="0.02" numOctaves="10" result="noise2" seed="1" />
          <feOffset in="noise2" dx="0" dy="0" result="offsetNoise2">
            <animate attributeName="dy" values="0; -700" dur="6s" repeatCount="indefinite" calcMode="linear" />
          </feOffset>
          <feTurbulence type="turbulence" baseFrequency="0.02" numOctaves="10" result="noise1" seed="2" />
          <feOffset in="noise1" dx="0" dy="0" result="offsetNoise3">
            <animate attributeName="dx" values="490; 0" dur="6s" repeatCount="indefinite" calcMode="linear" />
          </feOffset>
          <feTurbulence type="turbulence" baseFrequency="0.02" numOctaves="10" result="noise2" seed="2" />
          <feOffset in="noise2" dx="0" dy="0" result="offsetNoise4">
            <animate attributeName="dx" values="0; -490" dur="6s" repeatCount="indefinite" calcMode="linear" />
          </feOffset>
          <feComposite in="offsetNoise1" in2="offsetNoise2" result="part1" />
          <feComposite in="offsetNoise3" in2="offsetNoise4" result="part2" />
          <feBlend in="part1" in2="part2" mode="color-dodge" result="combinedNoise" />
          <feDisplacementMap in="SourceGraphic" in2="combinedNoise" scale="30" xChannelSelector="R" yChannelSelector="B" />
        </filter>
      </defs>
    </svg>
    <div class="card">
      <div class="inner">
        <div class="border">
          <div class="main"></div>
        </div>
        <div class="glow-1"></div>
        <div class="glow-2"></div>
      </div>
      <div class="overlay-1"></div>
      <div class="overlay-2"></div>
      <div class="bg-glow"></div>
      <div class="content">
        <div class="top">
          <div class="glass">
            Dramatic
          </div>
          <p class="title">Electric Border</p>
        </div>
        <hr class="divider" />
        <div class="bottom">
          <p class="description">In case you'd like to emphasize something very dramatically.</p>
        </div>
      </div>
    </div>
  </main>
</body>
</html>

CSS