style.css

body {
    background-image: url("./source/Youtube-Video-UI.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    /* background-color: #cccccc; */
    height: 100vh;
    /* overflow: hidden; */
   }

   #topNav {
    width: 100vw;
    height: 5vh;
    /* background-color: aqua; */
   }


   #middle{
    width: 100vw;
    height: 95vh;
    /* background-color: red; */
   }

   #leftColumn{
    width: 180vw;
    height: 70vh;
   }

   #rightColumn{
    width: 180vw;
    height: 70vh;
   }

   #mainVideo{
    border:0px #ffffff none;
    display: block;
    margin-left:1vw;
    margin-top: 3vh;
    /* height: 290px; */
    height: 80vh;
    width: 90%; 
   }

   /* #main{
    border:0px #ffffff none;
    background-color: red;
    display: block;
    margin-left:1vw;
    margin-top: 5vh;
    height: 30px;
    width: 20px; 
   } */