.nav-collapse-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:1.2em;
  height:1.2em;
  padding:0;
  margin-right:6px;
  color:var(--md-default-fg, #2b2b2b);
}

/* Slightly reduce indent of nested lists when collapsed/expanded */
.md-nav__list > li .md-nav__list,
.md-nav__sublist{
  margin-left: 0.5em;
}

/* Ensure toggle button blends with text */
.nav-collapse-toggle:focus{ outline: 2px solid rgba(0,0,0,0.08); outline-offset: 2px; }