kendoui.for.jquery.2020.3.1021.commercial-source\src\styles\mobile\common\modalview.less
Line 56:     box-flex: 1;

kendoui.for.jquery.2020.3.1021.commercial-source\src\styles\mobile\common\buttongroup.less
Line 31:     margin-collapse: separate;

kendoui.for.jquery.2020.3.1021.commercial-source\src\styles\mobile\common\scroller.less
Line 103:     margin-collapse: separate;

kendoui.for.jquery.2020.3.1021.commercial-source\src\styles\web\common\mixins.less
Line 54: 

.flex-align(@alignment) {
    flex-align: @alignment; 
}