body{
  margin: 0px;
}
#mainContainer {
    position: relative;
  }

  #content,
  #adContainer {
    position: absolute;
    top: 0;
    left: 0;
  }

  #content{background-color: black;}
  #contentElement {
    overflow: hidden;
  }

  #playButton {
   /*  margin-top:10px;
    margin-left:10px; */
    height: 60px;
    padding: 15px;
    font-size: 22px;
    display: none;
    position: absolute;
  }