Add CPU eating loader waiting for configuration to finish

src/app/loader/loader.component.html

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+<div *ngIf="loading" class="loading-container">
+  <div class=" loader">
+    <div class="outer"></div>
+    <div class="middle"></div>
+    <div class="inner"></div>
+  </div>
+</div>

src/app/loader/loader.component.scss

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+.loading-container {
+  position: absolute;
+  top: 0;
+  left: 0;
+  margin: 0;
+  padding: 0;
+  display: flex;
+  width: 100%;
+  height: 100%;
+  align-items: center;
+  justify-content: center;
+  background: rgba(0, 0, 0, 0.2);
+  z-index: 99999;
+  filter: blur(0px)!important;
+}
+  
+.loader {
+  position: relative;
+  filter: blur(0px) !important;
+}
+
+.outer,
+.middle,
+.inner {
+  border: 3px solid transparent;
+  border-top-color: #277EEC;
+  border-right-color: #277EEC;
+  border-radius: 50%;
+  position: absolute;
+  top: 50%;
+  left: 50%;
+}
+
+.outer {
+  width: 3.5em;
+  height: 3.5em;
+  margin-left: -1.75em;
+  margin-top: -1.75em;
+  animation: spin 2s linear infinite;
+}
+
+.middle {
+  width: 2.1em;
+  height: 2.1em;
+  margin-left: -1.05em;
+  margin-top: -1.05em;
+  animation: spin 1.75s linear reverse infinite;
+}
+
+.inner {
+  width: 0.8em;
+  height: 0.8em;
+  margin-left: -0.4em;
+  margin-top: -0.4em;
+  animation: spin 1.5s linear infinite;
+}
+
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
+}

src/app/loader/loader.component.ts

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+import { Component, Input, AfterViewInit, OnInit } from '@angular/core';
+import { ConfigReadyService } from '../services/config.service';
+
+
+@Component({
+  selector: 'app-loader',
+  templateUrl: './loader.component.html',
+  styleUrls: ['./loader.component.scss']
+})
+export class LoaderComponent implements OnInit, AfterViewInit {
+  @Input() toBlur: HTMLElement;
+  loading = true;
+
+  constructor(private configReadyService: ConfigReadyService) {}
+
+  ngOnInit() {
+    this.configReadyService.init();
+  }
+
+  ngAfterViewInit() {
+    this.toBlur.classList.add('blur');
+    this.configReadyService.configDone.subscribe(
+      () => {
+        this.loading = false;
+        this.toBlur.classList.remove('blur');
+      }
+    );
+  }
+}