web-ui: general app viewport improved

some classes on html and body tags were added
to keep the app always on full screen, also a
container class was added around the router-outled
tag to keep all views consistent

web-ui/src/app/app.component.html

@@ -1,6 +1,6 @@
-
 <app-navbar></app-navbar>
-<router-outlet></router-outlet>
+<div class="container-fluid">
+  <router-outlet></router-outlet>
+</div>
 <spinner [filteredUrlPatterns]="['/blocks$']"></spinner>
-<hr><hr>
 <app-footer></app-footer>

web-ui/src/styles.css

@@ -1,3 +1,15 @@
 /* You can add global styles to this file, and also import other style files */
 @import '~bootstrap/dist/css/bootstrap.min.css';
 @import "~ngx-toastr/toastr.css";
+
+html {
+   margin: 0px;
+   height: 100%;
+   width: 100%;
+}
+
+body {
+   margin: 0px;
+   min-height: 100%;
+   width: 100%;
+}