#oled-color-box {
    width: 100%;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
}
#fullscreen-btn,
#start-deadpixel-test {
    padding: 12px 24px;
    font-size: 16px;
    background: #222;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}
#fullscreen-btn:hover,
#start-deadpixel-test:hover {
    background: #444;
}
#sync-tester-container {
    margin-top: 20px;
    text-align: center;
}
#sync-tester-canvas {
    border: 1px solid #ccc;
    background: #000;
    margin-bottom: 10px;
}