Automatic Image Slider in HTML CSS

<div class="container">
  <h1>Automatic Image Slider</h1>
  <p class="subtitle">Pure CSS Animation • No JavaScript</p>

  <div class="slider-wrapper">
    <div class="slider">
      <div class="slides">
        <div class="slide">
          <div class="slide-content">
            <div class="slide-number">01</div>
            <div class="slide-text">Purple Galaxy</div>
          </div>
        </div>
        <div class="slide">
          <div class="slide-content">
            <div class="slide-number">02</div>
            <div class="slide-text">Pink Sunset</div>
          </div>
        </div>
        <div class="slide">
          <div class="slide-content">
            <div class="slide-number">03</div>
            <div class="slide-text">Ocean Blue</div>
          </div>
        </div>
        <div class="slide">
          <div class="slide-content">
            <div class="slide-number">04</div>
            <div class="slide-text">Mint Fresh</div>
          </div>
        </div>
        <div class="slide">
          <div class="slide-content">
            <div class="slide-number">05</div>
            <div class="slide-text">Summer Vibes</div>
          </div>
        </div>
      </div>
    </div>

    <div class="indicators">
      <div class="indicator"></div>
      <div class="indicator"></div>
      <div class="indicator"></div>
      <div class="indicator"></div>
      <div class="indicator"></div>
    </div>
  </div>

  <div class="info">
    <p><strong>Pure CSS Animation:</strong> This slider uses only CSS keyframe animations with no JavaScript. Each slide displays for 4 seconds before transitioning. The indicators pulse in sync with the active slide.</p>
  </div>
</div>

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: #0a0a0a;
            color: #fff;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 900px;
            width: 100%;
        }

        h1 {
            text-align: center;
            font-size: 32px;
            font-weight: 600;
            margin-bottom: 12px;
            color: #00FFFF;
            text-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
        }

        .subtitle {
            text-align: center;
            color: #888;
            font-size: 14px;
            margin-bottom: 40px;
        }

        .slider-wrapper {
            background: #1a1a1a;
            border-radius: 20px;
            padding: 30px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
            border: 2px solid #00FFFF;
        }

        .slider {
            position: relative;
            width: 100%;
            height: 500px;
            overflow: hidden;
            border-radius: 12px;
        }

        .slides {
            display: flex;
            width: 500%;
            height: 100%;
            animation: slide 20s infinite;
        }

        .slide {
            width: 20%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 48px;
            font-weight: 700;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .slide::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(0, 255, 255, 0.3), rgba(0, 255, 255, 0.1));
        }

        .slide:nth-child(1) {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

        .slide:nth-child(2) {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        }

        .slide:nth-child(3) {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
        }

        .slide:nth-child(4) {
            background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
        }

        .slide:nth-child(5) {
            background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
        }

        .slide-content {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .slide-number {
            font-size: 72px;
            margin-bottom: 8px;
            text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
        }

        .slide-text {
            font-size: 24px;
            font-weight: 500;
        }

        @keyframes slide {
            0% { transform: translateX(0%); }
            20% { transform: translateX(0%); }
            25% { transform: translateX(-20%); }
            45% { transform: translateX(-20%); }
            50% { transform: translateX(-40%); }
            70% { transform: translateX(-40%); }
            75% { transform: translateX(-60%); }
            95% { transform: translateX(-60%); }
            100% { transform: translateX(-80%); }
        }

        .indicators {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-top: 30px;
        }

        .indicator {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #333;
            border: 2px solid #00FFFF;
            animation: indicatorPulse 20s infinite;
        }

        .indicator:nth-child(1) {
            animation-delay: 0s;
        }

        .indicator:nth-child(2) {
            animation-delay: 4s;
        }

        .indicator:nth-child(3) {
            animation-delay: 8s;
        }

        .indicator:nth-child(4) {
            animation-delay: 12s;
        }

        .indicator:nth-child(5) {
            animation-delay: 16s;
        }

        @keyframes indicatorPulse {
            0%, 18%, 100% {
                background: #333;
                transform: scale(1);
            }
            20%, 95% {
                background: #00FFFF;
                transform: scale(1.3);
                box-shadow: 0 0 15px rgba(0, 255, 255, 0.8);
            }
        }

        .info {
            text-align: center;
            margin-top: 30px;
            padding: 20px;
            background: #111;
            border-radius: 12px;
            border: 1px solid #222;
        }

        .info p {
            font-size: 14px;
            color: #888;
            line-height: 1.6;
        }

        .info strong {
            color: #00FFFF;
        }

        @media (max-width: 768px) {
            .slider {
                height: 350px;
            }

            .slide-number {
                font-size: 48px;
            }

            .slide-text {
                font-size: 18px;
            }

            h1 {
                font-size: 24px;
            }
        }