* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Arial', sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        header {
            text-align: center;
            margin: 20px 0;
            color: white;
        }
        
        h1 {
            font-size: 2.5rem;
            margin-bottom: 15px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        
        #Shape {
            padding: 10px 15px;
            font-size: 1.1rem;
            border: 2px solid #fff;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.9);
            color: #333;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }
        
        #Shape:hover {
            background: white;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.2);
        }
        
        #Shape:focus {
            outline: none;
            border-color: #4CAF50;
        }
        
        main {
            display: flex;
            justify-content: center;
            align-items: center;
            flex: 1;
        }
        
        canvas {
            border: 3px solid white;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.95);
            box-shadow: 0 8px 32px rgba(0,0,0,0.3);
            cursor: crosshair;
            transition: all 0.3s ease;
        }
        
        /* canvas:hover {
            transform: scale(1.02);
            box-shadow: 0 12px 40px rgba(0,0,0,0.4);
        }
         */
        /* Instructions */
        .instructions {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(255, 255, 255, 0.9);
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
            max-width: 250px;
            font-size: 0.9rem;
            color: #333;
        }
        
        .instructions h3 {
            margin-bottom: 10px;
            color: #4CAF50;
        }
        
        .instructions ul {
            list-style: none;
            padding: 0;
        }
        
        .instructions li {
            margin-bottom: 5px;
        }