body {
    min-height: 100vh;
    overflow: hidden;
    cursor: crosshair;
}

span {
    position: absolute;
    background: blue;
    border-radius: 300px;
    animation: animColor 8s forwards;
    transform: translate(-50%, -50%);
    opacity: 0;
}

.score {
    margin: auto;
    text-align: center;
}

h1 {
    font-size: 64px;
    opacity: 0.4;
}

@keyframes animColor {
    100% {
        filter: hue-rotate(720deg);
        top: -300px;
        opacity: 1;
    }
}