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HTML

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Matrix Effect</title>
  <style>
    body {
      margin: 0;
      overflow: hidden;
      background: black;
    }

canvas {
      display: block;
    }
  </style>
</head>
<body>
  <canvas id="matrix"></canvas>

// Set canvas full screen
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;

const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    const fontSize = 16;
    const columns = canvas.width / fontSize; // Number of columns for the rain
    const drops = Array(Math.floor(columns)).fill(1); // Initial positions for the drops

function drawMatrix() {
      // Darken the background a little every frame
      ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
      ctx.fillRect(0, 0, canvas.width, canvas.height);

// Set text color to green and font size
      ctx.fillStyle = '#0F0';
      ctx.font = fontSize + 'px monospace';

// Loop over the drops array and draw the rain
      for (let i = 0; i < drops.length; i++) {
        const text = letters[Math.floor(Math.random() * letters.length)];
        ctx.fillText(text, i * fontSize, drops[i] * fontSize);

// Send the drop back to the top randomly after it has crossed the screen
        // Also, create a random effect by resetting some drops to 1 after they fall
        if (drops[i] * fontSize > canvas.height && Math.random() > 0.975) {
          drops[i] = 0;
        }

// Increment the drop's y position
        drops[i]++;
      }
    }

setInterval(drawMatrix, 50);

// Resize canvas if window size changes
    window.addEventListener('resize', () => {
      canvas.width = window.innerWidth;
      canvas.height = window.innerHeight;
    });
  </script>
</body>
</html>

CSS