HTMLify

html,
body {
    height: 100%;
}

body {
    background-color: #151515;
    color: white;
    display: grid;
    place-items: center;
}

button {
    appearance: none;
    background-color: #fff;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    height: 50px;
    width: 50px;
    outline: none;
    position: relative;
}

button.active #open-cubes rect,
button.active #close-cubes rect {
    fill: #cf2d45;
}

button svg {
    position: absolute;
    left: 0;
    top: 0;
}

button svg #open-cubes rect,
button svg #close-cubes rect {
    fill: #294bf5;
    transition: fill 600ms ease;
}

button svg #close-cubes rect {
    opacity: 0;
}

.spin-in {
    animation: spin-in 1300ms ease 1 forwards 10ms;
    transform-origin: center;
}

.spin-out {
    animation: spin-out 1300ms ease 1 forwards 10ms;
    transform-origin: center;
}

@keyframes spin-in {
    0% {
        opacity: 0;
        transform: rotate(0deg);
    }

    100% {
        opacity: 1;
        transform: rotate(720deg);
    }
}

@keyframes spin-out {
    0% {
        opacity: 1;
        transform: rotate(720deg);
    }

    100% {
        opacity: 0;
        transform: rotate(0deg);
    }
}