discourse/app/assets/stylesheets/desktop/group.scss

.group-nav {
  li {
    float: left;

    a, i {
      color: dark-light-choose($primary-medium, $secondary-high);
    }

    .active {
      a, i {
        color: $secondary;
      }
    }
  }

  margin-bottom: 30px;
}

.group-info {
  margin-bottom: 20px;
}

.group-activity-nav,
.group-messages-nav,
.group-manage-nav
{
  width: 15%;
  background-color: transparent;

  li {
    border: none;

    a {
      padding: 8px 13px;
    }

    a.active {
      background-color: transparent;
      font-weight: bold;
      color: $primary;
    }

    a.active:after {
      display: none;
    }
  }
}

.group-activity-outlet,
.group-messages-outlet,
.group-manage-outlet
{
  width: 85%;
}

.group-manage {
  .form-horizontal {
    button {
      float: none;
    }
  }
}