body {
    padding-top: 70px;
}

.flex {
    display: flex;
    flex-wrap: wrap;
  }

  .jumbotron {
      background: #ecf0f1;
      color: #2c3e50;
  }

  .navbar-inverse{
      background: #2c3e50;
  }

  .navbar-inverse .navbar-nav>li>a {
    color: #ffffff;
}

.navbar-inverse .navbar-brand {
    color: #ffffff;
}