#download_video_btn {
   display: none;
   border: 1px solid black;
   background-color: lightblue;
   text-decoration: none;
   padding: 2px;
   text-align: center;
   color: white;
}

#download_video_btn:hover {
   background-color: darkblue;
}

#status_bar_wrapper {
   display: none;
   position: relative;
   height: 25px;
   width: 100%;
   border: 1px solid black;
}

#status_bar_msg {
   position: absolute;
   height: 100%;
   width: 100%;
   background-color: rgba(0,0,0,0);
   color: black;
   display: flex;
   justify-content: center;
   align-content: center;
   font-size: 20px;
}

#status_bar {
   width: 0;
   height: 100%;
   background-color: green;
   transition: all;
}