[BUG]If first element inside .nav-sidebar is a li.nav-header the padding is different to other li.nav-header

Describe the bug If first element inside .nav-sidebar is a li.nav-header the padding is different to other li.nav-header. I often like to use a .nav-header as the first item.

To Reproduce Steps to reproduce the behavior:

1. Add <li class="nav-header">TEST</li> as the first item in the .nav-sidebar

Expected behavior The padding to the left/right should be of the li.nav-header should be 1rem as per all subsequent headers

Screenshots

Environment (please complete the following information):

• AdminLTE Version: 3.1.0-rc
• Operating System: Windows 10
• Browser (Version): Chrome (latest)

Additional context The problem seems to be in _main-sidebar.scss

.nav-header {
    font-size: .9rem;
    padding: $nav-link-padding-y;

    &:not(:first-of-type) {
      padding: 1.7rem 1rem .5rem;
    }
  }

So the .nav-header only gets the 1rem for left and right if it is not the first-of-type.

[pauldbentley]

Thanks @REJack that fixes the issue.

[REJack]

Fixed with 378a39ea125c216004ac4127f64260f21d3a1932.