/* Reset margin/padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: black;
    /* tránh khoảng trống lộ ra */
    height: 100vh;
    overflow: hidden;
}

/* Fullscreen video that maintains aspect ratio */
#bgVideo {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 100vw;
    height: 100vh;
    transform: translate(-50%, -50%);
    object-fit: contain;
    /* 👈 Không bị méo */
    object-position: center center;
    z-index: -1;
    background-color: black;
}