CSS Painting

<div class="css-painting"></div>

.css-painting {
    width: 200px;
    height: 200px;
    border-radius: 20px;
    background: linear-gradient(
        45deg,
        #667eea,
        #764ba2,
        #f093fb,
        #f5576c,
        #4ecdc4
    );
    background-size: 400% 400%;
    animation: paintingFlow 8s ease infinite;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.css-painting::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(
        circle at 50% 50%,
        rgba(255, 255, 255, 0.2),
        transparent 70%
    );
    animation: paintingPulse 3s ease-in-out infinite;
}

@keyframes paintingFlow {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes paintingPulse {
    0%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.1);
    }
}