#controls {
    flex-grow: .5;
    max-width:clamp(30vw,400px);
    display: flex;
    justify-content: space-between;
    flex-direction: column;
    gap: 1em;
    padding: 10px;
    user-select: none;
    text-align: center;
}
.control{
    border: 1p dashed var(--clr5);
}
.control p {
    margin: 0;
}
input[type='range']{
    width: 80%;
}
.colour input {
    height: 100%;
}
.control.speed {
    display: none;
}
.control.anim:has(input.anim:checked) + .control.speed {
    display: block;
}
.anim{
    white-space: nowrap;
}
div.control.start {
    --clr1: seagreen;
    margin-inline: auto;
    width: 50px;
    height: 50px;
    display: grid;
    padding: 0px;
    transition: transform 0.4s linear;
}
button.start {
    background: radial-gradient(blue, var(--clr1));
    border: none;
    border-radius: 50%;
    height: 40px;
    width: 40px;
    color: aquamarine;
    display: block;
    grid-area: pile;
}
.start.border {
    grid-area: pile;
    margin: 0px;
    padding: 0px;
    border: 1px solid var(--clr1);
    height: 40px;
    width: 40px;
    border-radius: 50%;
    animation: 4s infinite border;
    z-index: -1;
    background: radial-gradient(var(--clr1), rgba(0, 0, 0, 0.3));
}
div.start:hover {
    transform: scale(1.1);
    .border {
        animation-play-state: paused;
    }
}
@keyframes border {
    0%,
    100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.5);
    }
}