#primecanvas {
    display: block;
    max-width: 100%;
    border-radius: 8px;
    image-rendering: pixelated;
}

.primes-hint {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    min-height: 1.3em;
}