DocumentServer/OfficeWeb/apps/spreadsheeteditor/mobile/resources/sass/_application-mixins.scss

@mixin application-icon-normal($name, $index) {
  .x-button-icon.#{$name},
  .list-icon.#{$name} {
    background-image: url($icons-default-path);
    background-color: transparent;
    background-position: 0 -1 * $index * $icons-default-size;
    background-size: $icons-default-image-width $icons-default-image-height;
  }

  .x-button-pressing,
  .x-button-pressed,
  .x-button-active,
  .x-item-pressed {
    .x-button-icon.#{$name},
    .list-icon.#{$name} {
      background-position: -1 * $icons-default-size -1 * $index * $icons-default-size;
    }
  }
}