@mixin private-expansion-focus {
  .mat-expansion-panel {
    & .mat-expansion-panel-header.cdk-keyboard-focused,
    & .mat-expansion-panel-header.cdk-program-focused,
    &:not(.mat-expanded) .mat-expansion-panel-header:hover {
      &:not([aria-disabled='true']) {
        @content;
      }
    }
  }
}