Hello,

We will take a closer look at this problem and try to provide a better way for changing these colors. For now please use the solution provided by @NCIIT as a workaround.

I had the same problem, it seems there is no option to add class, just do this in CSS

//<mdb-progress-bar>
.progress {
  .mat-progress-bar-buffer {
    background-color: #90caf9 !important; // static light bg-colour
  }
  .mat-progress-bar-fill::after {
    background-color: #0d47a1 !important; // infinite scrolling bg-colour
  }
}