/*Button style*/
body {
    background-image: url("https://www.solidbackgrounds.com/images/3840x2160/3840x2160-black-solid-color-background.jpg");
  }

  #myBtn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: red;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
  }

  #myBtn:hover {
    background-color: #555;
  }

/*navbar style*/
body {
    margin: 0;
    font-size: 28px;
    font-family: Arial, Helvetica, sans-serif;
  }

  .header {
    background-color: #23cfdb;
    padding: 30px;
    text-align: center;
  }

  #navbar {
    overflow: hidden;
    background-color: #333;
  }

  #navbar a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
  }

  #navbar a:hover {
    background-color: #ddd;
    color: black;
  }

  #navbar a.active {
    background-color: #4CAF50;
    color: white;
  }

  .content {
    padding: 16px;
  }

  .sticky {
    position: fixed;
    top: 0;
    width: 100%;
  }

  .sticky+.content {
    padding-top: 60px;
  }