ul {
    list-style: none;
    display: grid;
    height: 50px;
    width: 100%;
    margin: auto;
    padding: 0px;
    font-family: monospace;
    color: White;
      }

      li {
        padding: 1px;
      }

    button {
    height: 50px;
    width: 100%;
    font-family: monospace;
    color: White;
    background-color: black;
    position: relative;
      }

    #SubMenu {
        display: none;
      }
      
      #MainMenu:hover #SubMenu {
        display: grid;
      }

      .bgimg {
        width: 100%;
        height: 50%;

      }

      #btnoverview:hover{
        background-color: white;
        color: black;
      }
      
      #btnhistory:hover{
        background-color: white;
        color: black;
      }
      
      #btnvs:hover{
        background-color: white;
        color: black;
      }
      
      #btnEvo:hover{
        background-color: white;
        color: black;
      }
      
      #btnProtocols:hover{
        background-color: white;
        color: black;
      }
      
      #btnArchitecture:hover{
        background-color: white;
        color: black;
      }
      
      #btnEngineer:hover{
        background-color: white;
        color: black;
      }

      a {
        text-decoration: none;
        color: white;
      }
      a:hover
      {
        color: black;
      }