body {
}


.play_btn {
    margin: auto;
    background: #00c9ffcc;
    color: #fff;
    font-size: 40px;
    margin-top: 20%;
    padding: 5px 30px;
}
.play_btn:hover { 
    color: #fff; 
}


.black_bg { background:#000;
}

.iframe {
    height: 100vh;
    width: 75%;
    margin: auto;
    display: block;
    border: 2px solid #cccc;
}

.header {
    margin-bottom: 30px;
    margin-top: 15px;
}

.footer {
    margin-bottom: 30px;
    margin-top: 15px;
}

.confirm_btn {
    background: #00c9ffcc;
    color: #fff;
    font-size: 20px; 
    padding: 5px 30px;
}