$collapse-button__width: rem-calc(16);
$collapse-button__height: rem-calc(96);
$collapse-button__border-radius: 0 $collapse-button__width
  $collapse-button__width 0;
$collapse-button__color: $md-white-100;

$collapse-button__background: $md-gray-90;
$collapse-button__background--focus: $black-80;