app/node_modules/ng-zorro-antd/style/mixins/index.less

// Mixins
// --------------------------------------------------
@import 'size';
@import 'compatibility';
@import 'clearfix';
@import 'iconfont';
@import 'typography';
@import 'customize';
@import 'box';
@import 'modal-mask';
@import 'motion';
@import 'reset';
@import 'operation-unit';
@import 'rounded-arrow';
@import 'compact-item';
@import 'compact-item-vertical';