body { font-family: Arial, sans-serif; margin: 0; background: #f5f5f5; }
.url-form { padding: 10px; text-align: center; background: #333; color: white; }
.url-form input { width: 60%; padding: 8px; }
.controls { margin: 10px auto; text-align: center; }
.controls input, .controls button { margin: 0 5px; padding: 8px; }
#screenshotCanvas { border: 1px solid #ccc; display: block; margin: 0 auto; position: relative; }
.annotation-dot {
    position: absolute;
    background: yellow;
    border: 1px solid black;
    padding: 4px;
    font-size: 12px;
    z-index: 1000;
}
.hidden { display: none; }