Do not use a href="#" for buttons

[sventschui]

It is discouraged to use <a href="#" ... for buttons. Use real buttons (<button>) for accessibility reasons.

Using real buttons will break some stuff (e.g. burger) because buttons have a background and border by default.

.header-burger {
  border: none;
  background: transparent;
}

.header-meta-menu-link {
  border: none;
  background: transparent;
}

.mask {
  border: None;
}