External Style Sheet: What I used for CSS

  Button1 {
      border: none;
      font-size: 20px;
      background-repeat: no-repeat;
      background-size: 100px;
      color: white;
      vertical-align: left;
      margin: none;
      float: left;
      position: relative;
      padding-top: 130px;
      padding-right: 30px;
      background-color: black;
  }
    Button1:hover {
      color: blue;
      font-size: 20px;
  }
    Button:hover {
      color: blue;
      font-size: 20px;
  }
    #menu{
      font-size: 20px;
      display: inline-block;
      vertical-align: top;
      position: relative;
  }
      b {
      color: #0033cc;
      display: flex;
      flex: 100;
      justify-content: space-around;
      text-align: center;
      width: 100
    }
    a {
      font-weight:bold;
      margin:auto;
      color: black;
      text-align: center;
      text-decoration: none;
  }
    table {
      border-collapse: collapse;
      width: 20;
  }
    tr {
      display: flex;
      flex: 100%;
      justify-content: space-around;
      text-align: center;
      width: 20
      
  }
    td {
      text-align: center;
      
  }