How to deploy the bpmn project with angular in server

I was using modeler.component.css inside in my app but after i need to build that time showing error in properties.css file how can we resolve.
Thanks

i am getting like this type error

ERROR in ./~/css-loader?sourceMap!./~/bpmn-js-properties-panel/styles/properties.less
Module build failed: Unknown word (17:3)

  15 | 
  16 | .bpp-properties-panel {
> 17 |   .overlay();
     |   ^
  18 |   position: relative;
  19 | 
  20 |   &:empty {

 @ ./~/css-loader?sourceMap!./src/assets/bpmn/modeler.component.css 6:10-144