.svggame-container {
    position: relative;
    width: 100%;
    max-width: 420px; /* match your design width */
    margin: 0 auto;
}

.svggame-bg {
    width: 100%;
    height: auto;
    display: block; /* removes inline whitespace */
}

.svggame-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%; /* critical: scales with the image */
    height: auto; /* critical: keeps aspect ratio */
    display: block;
    pointer-events: none; /* overlay is not interactive */
    border: 2px solid cyan;
}