body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(90deg, red, orange, yellow, green, blue, indigo, violet);
    background-size: 500% 500%;
    animation: rainbow 15s ease infinite;
}

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

.container {
    text-align: center;
    position: relative;
}

#center-img {
    max-width: 800px;
    max-height: 800px;
    width: auto;
    height: auto;
    animation: pulse 5s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.5);
    }
    50% {
        transform: scale(1);
    }
    100% {
        transform: scale(0.5);
    }
}

.poo {
    position: fixed;
    font-size: 30px;
}

#canvas {
    position: fixed;
    top: 0;
    left: 0;
    pointer-events: none;
}