body, html {
    margin: 0;
    padding: 0;
    height: 100%;
}

.bg-cover {
    background: url('bg.png') no-repeat center center;
    background-size: cover;
}

.card {
    border-radius: 12px;
}


video, canvas {
    border: 2px solid #007bff;
    border-radius: 8px;
}

button {
    margin-top: 10px;
}