src/js/panel.js

export function drawPanel(ctx, x, y, width, height, margin = 2) {
    // Draw margin/border
    ctx.fillStyle = 'rgba(255, 255, 255, 0.5)';
    ctx.fillRect(x, y, width, height);

    // Draw background with margin
    ctx.fillStyle = 'black';
    ctx.globalAlpha = 1.0;
    ctx.fillRect(
        x + margin,
        y + margin,
        width - (margin * 2),
        height - (margin * 2)
    );
}