.modal-bg {
    position: fixed;
    top: 0;
    left: 0;
    background: rgba(0, 0, 0, .8);
    width: 100vw;
    height: 100vh;
    backdrop-filter: blur(5px);
    overflow-y: scroll;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    transition: opacity 0.4s ease-in-out;
}

.modal {
    width: 90vw;
    position: relative;
    padding-top: 56.25%;
    margin: 2em 0;
}

.modal iframe {
    position: absolute;
    top: 10%;
    left: 0;
    border: none;
    width: 100%;
    height: 100%;
}

.modal-bg {
    display: none;
    opacity: 0;
}

@media screen and (min-width: 900px) {
    .modal {
        padding-top: 0;
        width: 809px;
        height: 505px;
    }
}