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Answer : aren't you dividing by zero here when host = 0 in the for loop? updateProgress(100/host); you can use a variable hosts to keep track of the number of hosts you have.Then the progress will be as below. var hosts = 23;// total number of hosts updateProgress((host/hosts)*100); The other thing is the ajax you're firing is asynchronous, so what's happening is it fires and doesn't wait for the results. You can either "scan" each host serially one at a time updating the progress bar or scan all of them simultaneously having the progress bar update as the asynch results come back. Can you specify which behavior you're trying to achieve? [UPDATE] toggle async flag in the ajax call below for what you want. function updateProgress(percentage){ if(percentage > 100) percentage = 100; $('#progressBar').css('width', percentage+'%'); $('#progressBar').html(percentage+'%'); } var hosts = 23; va...

Answer : You can use ::ng-deep selector to achieve what you want, this answer has some info on it. How I did it: CSS ::ng-deep .mat-progress-bar-fill::after { background-color: #1E457C; } ::ng-deep .mat-progress-bar-buffer { background: #E4E8EB; } ::ng-deep .mat-progress-bar { border-radius: 2px; } HTML <mat-progress-bar mode="determinate" value="{{progress}}"></mat-progress-bar> And the result is this: EDIT: I found a way to avoid using ::ng-deep as it will be removed from angular soon. It seems that if you move your style from your component.css file to the global styles.css file it will work without ::ng-deep . So, a style defined above can change in mat-progress-bar .mat-progress-bar-buffer { background: #E4E8EB; } Move it to styles.css and it will be applied like this: LATER EDIT As an explanation why setting styles in the global style sheet works: For components the default is that angul...