body {
    font-family: Arial, sans-serif;
    background-color: #000;
    color: #ffd700;
    text-align: center;
    margin: 0;
    padding: 10px;
}
video {
    width: 100%;
    max-width: 400px;
    border: 2px solid #ffd700;
}
#selo {
    position: absolute;
    width: 100px;
    top: 50px;
    left: 50px;
    display: none;
    cursor: move;
    z-index: 10;
}
.buttons {
    margin-top: 10px;
}
button {
    padding: 10px;
    margin: 5px;
    background: #ffd700;
    border: none;
    color: #000;
    font-weight: bold;
}