.Bg{
    background-color: #93BDBF;
  }
  .topnav {
  background-color:lightgray;
  overflow: hidden
  }

.topnav a {
    margin-top: auto;
    overflow: hidden;
    float: right;
    background-color:lightgray;
    text-align: center;
    color: black;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 23px;
  }