#logo {
    margin-left: 40%
}

#btn {
    color: green;
    height: 30px;
    width: auto;
}

.w1-full{
    width: 50%;
}

#img-id{
    display: block;
    margin-left: 40px;
}

#video_elem {
    margin-left: 300px !important;
}

#url_input {
    display: flex;
    justify-content: center !important;
    justify-items: center !important;
    /* width: 900px; */

}