* {
    padding: 0;
    margin: 0%;
    box-sizing: border-box;
    font-family: 'Nunito Sans', sans-serif;
  }

  body{
    background-color: #53935d
  }

  header{
    display:inline-flex;
    width: 100%;
    transition: box-shadow 2s;
    background-color: #53935d;
    text-align: left;
  }

  header a{
    width: 25%;
    height: 80%;
    margin: auto;
    overflow: hidden;
    cursor: default;
    text-decoration: none;
    left: 0;
  }

  header h1{
    width: 75%;
    margin: 12px;
  }

  #secondary{
    margin: 36px;
    padding: 48px;
    display: grid;
    gap: 12px;
    height: auto;
    border-radius: 25px;
   background: #53935d;
    box-shadow:  4px 4px 10px #477d4f, -3px -3px 6px #5fa96b;
  }

  #third{
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr;
    height: auto;
    gap: 24px;
  }
  

  .button{
    text-align: center;
    position:sticky;
    font-size: 18px;
    font-weight: bold;
    padding: 20px;
    margin: 20px;
    color: white;
    border-radius: 15px;
    background: #53935d;
    box-shadow: 6px 6px 6px #477d4f, -6px -6px 8px #5fa96b;
    transition: box-shadow 0.2s;
    cursor: pointer;
  }
  
  .classroom{
    width: 100%;
    height: auto;
    border-radius: 12px;
  }

  .button:hover{
    background: #53935d;
    box-shadow:  4px 4px 10px #477d4f, -3px -3px 6px #5fa96b;
  }

  h1{
    margin-top: 12px;
    font-weight: bold;
    font-size: 78px;
    text-decoration: underline;
    text-align: center;
    color: white;
  }

  figure{
    padding-top: 24px;
    padding-bottom: 24px;
    height: auto;
    width: 100%;
    margin: auto;
    text-align: center;
  }

  .title{
    text-decoration: underline;
    padding-top: 0px;
    font-weight: bold;
  }

  h2{
    font-size: 32px;
    font-weight:lighter;
    text-align: center;
    color: white;
  }

  @media screen and (max-width: 1440px){
    header{
      display: inline;
    }

    #secondary{
      grid-template-columns: 1fr;
      grid-template-rows: 1fr 30fr;
      margin: 8px;
      padding: 12px;
    }

    .title{
    text-decoration: underline;
    padding-top: 28px;
  }

    #third{
      grid-template-columns: 1fr;
      grid-template-rows: 1fr 1fr 1fr;
      gap: 6px;
      margin: 8px;
    }

    figcaption{
      text-align: left;
    }
  }

  iframe{
    width: 100%;
      aspect-ratio: 16 / 9;
      height: auto;
      border-radius: 12px;
  }
  
  h3{
    color: white;
    text-decoration: underline;
    font-size: 2vh;
    margin: 12px;
  }

  figcaption{
    color: white;
    text-align: left;
    font-size: 1.5vh;
    margin: 12px;
    min-height: 150px;
  }