* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
  }
  #mainContent {
    display: flex;
    border: thin blue solid;
    padding: 10px;
    width: 80%;
    margin: 10px auto;
  }
  #tutVidTitle {
    font-family: 'arial narrow', sans-serif;
    font-weight: 100;
    background: #222024;
    color: #32a6da;
    padding: 5px;
    margin-top: 4px;
  }
  #videoSizer {
    flex: 2;
    width: 100%;
  }
  #videoWrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
    overflow: hidden;
  }
  iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
  }
  #videoList {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 15px;
    background: white;
    margin: 0 5px;
    align-items: center;
  }
  #videoList a {
    text-decoration: none;
    font-family: 'arial narrow', sans-serif;
    color: black;
    display: block;
    padding: 10px;
    background: white;
    margin: 4px;
    width: 100%;
    transition: .4s;
    border: 1px rgb(179, 184, 179) solid;
  }
  #videoList a:hover, #videoList a:active {
    color: #fff;
    background: gray;
    border: 1px black solid;
    text-shadow: .5px .5px black;
  }
  input:checked ~ a {
    color: #fff;
    background: #cccccc;
    border: 1px black solid;
    text-shadow: .5px .5px black;
  }
  
  @media screen and (max-width: 800px) {
    #mainContent {
      flex-direction: column;
    }
    #videoList {
      padding-top: 20px;
      margin: 5px 0;
    }
  }