* {
    box-sizing: border-box;
  }
  body {
    background-color: #deded8;
    font-family: trebuchet, geneva, sans-serif;
    display: flex;
    flex-direction: column;
  
  }
  article, aside, footer, header {
    padding:10px;
  }
  main{
    border-left: solid black 1px;
    border-right: solid black 1px;
    max-width: 1400px;
    margin-left:auto;
    margin-right:auto;
  }
  header, footer {
    background-color: #333;
    color: #ddd;
    text-align: center;
    border-bottom: 1px solid #fff;
  }
  h1, h2, h3{
    text-align: center;
  }
  #columnHolder{
      display:flex;
      flex-direction:row;
  }
  #sectionContent{
      border-top: solid black 1px;
      padding:10px;
  }
  #invis, #empty{
    display:none;
  }
  article {
      flex-basis:100%;
      border-right: solid black 1px;
    }
  
  article:nth-child(4){
    border-right:none;
  }
  nav {
    background-color: white;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  }
  nav a:hover{
    background: #666;
    color: white;
  }
  ul:not(#list){
    display: flex;
    flex-direction:row;
    margin:0;
    padding:0;
  }
  ul:not(#list) li{
    flex: auto;
    list-style-type:none;
    border-right:solid black 1px;
    border-bottom:solid black 1px;
  }
  ul:not(#list) li:nth-child(1){
    border-left:solid black 1px;
  }
  ul li a {
    display: flex;
    flex: auto;
    text-align:center;
    text-decoration: none;
    justify-content: center;
    font-size: 1.2rem;
    color: black; 
    padding:10px;
  }
  
#diagram, #visual {
    width: 30rem;
}