NavBarStyle.css

    .topnav {
    overflow: hidden;
    background-color: darkblue;
    }
    .topnav a {
    float: left;
    display: block;
    color: #00E9FF;
    text-align: center;
    padding: 6px 16px;
    text-decoration: none;
    }
    
    .topnav a:hover {color: black; background-color:yellow
    }

    div.sticky {
        position: -webkit-sticky;
        position: sticky;
        top: 0;
        background-color:transparent;
        border: 3px solid white;
        padding: 5px;
        font-size: 18px;
        font-family:calibri;
        animation: myfirst 10s 100000000;
        
      }

      @keyframes myfirst {
        0%   {background: red; left: 0px; top: 0px;}
        25%  {background: orange; left: 0px; top: 0px;}
        50%  {background: blue; left: 0px; top: 0px;}
        75%  {background: green; left: 0px; top: 0px;}
        100% {background: red; left: 0px; top: 0px;}
      }