uBlock/platform/mv3/extension/css/zapper-ui.css

:root#ubol-zapper {
    --quit-button-size: max(4em, min(6em, calc(100vw / 8), calc(100vh / 8)));
    --ubol-overlay-fill: rgba(255,255,63,0.10);
    --ubol-overlay-border: #FF0;
}

#ubol-zapper aside {
    gap: 2px;
    right: 2px;
    top: 50%;
    transform: translateY(-50%);
}

#ubol-zapper aside > div {
    background-color: var(--surface-1);
    border: 1px solid rgba(0,0,0,0.5);
    box-sizing: border-box;
    fill: none;
    stroke: var(--ink-1);
    stroke-width: 2px;
    width: var(--quit-button-size);
    height: var(--quit-button-size);
}
#ubol-zapper aside > div:hover {
    background-color: var(--surface-2)
}
:root:not(.mobile) #pick {
    display: none;
}