on .mdlext-accordion__tabpanel nav {
    padding: 0;
  }

  #demo-drawer-accordion .mdlext-accordion__tabpanel .mdl-navigation__link {
    color: rgba(255, 255, 255, 0.87);
  }

  #demo-drawer-accordion .mdlext-accordion__tabpanel .mdl-navigation__link:hover {
    background-color: #212121;
  }

</style>


<aside class="mdl-layout__drawer">

  <ul id="demo-drawer-accordion" class="mdlext-accordion mdlext-js-accordion mdlext-accordion--vertical mdlext-js-ripple-effect mdlext-js-animation-effect mdlext-dark-c