NG Block UI Overwriting spinner styles

import { Component } from '@angular/core';
import {  BlockUI, NgBlockUI } from 'ng-block-ui';

@Component({
  selector: 'my-app',
  templateUrl: 'app/app.component.html',
  styleUrls: ['app/app.component.css']
})
export class AppComponent {
  // Wires up BlockUI instance
  @BlockUI() blockUI: NgBlockUI;

  constructor() {}
  
  toggleBlocking() {
     this.blockUI.start('Loading...');
     
    setTimeout(() => {
      this.blockUI.stop();
    }, 2500);
  }
  
}

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent }   from './app.component';
import { BlockUIModule } from 'ng-block-ui';

@NgModule({
  imports: [ 
    BrowserModule,
    BlockUIModule.forRoot()
  ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})

export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app.module';

const platform = platformBrowserDynamic();

platform.bootstrapModule(AppModule);

<!DOCTYPE html>
<html>
  <head>
    <title>ng-block-ui Example</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" href="styles.css">

    <!-- 1. Load libraries -->
     <!-- Polyfill(s) for older browsers -->
    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>

    <script src="https://unpkg.com/zone.js@0.7.2?main=browser"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3"></script>
    <script src="https://unpkg.com/systemjs@0.19.27/dist/system.src.js"></script>

    <!-- 2. Configure SystemJS -->
    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>

  <!-- 3. Display the application -->
  <body>
    <my-app></my-app>
  </body>
</html>

/**
 * PLUNKER VERSION
 * (based on systemjs.config.js in angular.io)
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
  System.config({
    // DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
    transpiler: 'ts',
    typescriptOptions: {
      tsconfig: true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    paths: {
      // paths serve as alias
      'npm:': 'https://unpkg.com/'
    },
    // map tells the System loader where to look for things
    map: {
      // our app is within the app folder
      app: 'app',

      // angular bundles
      '@angular/core': 'npm:@angular/core@5.2.10/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common@5.2.10/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler@5.2.10/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser@5.2.10/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@5.2.10/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles@5.2.10/http.umd.js',
      '@angular/router': 'npm:@angular/router@5.2.10/bundles/router.umd.js',
      '@angular/forms': 'npm:@angular/forms@5.2.10/bundles/forms.umd.js',
      '@angular/upgrade': 'npm:@angular/upgrade@5.2.10/bundles/upgrade.umd.js',

      // other libraries
      'rxjs':                       'npm:rxjs@5.5.6',
      'angular2-in-memory-web-api': 'npm:angular2-in-memory-web-api',
      'tslib':                      'npm:tslib',
      'ts':                         'npm:plugin-typescript@4.0.10/lib/plugin.js',
      'typescript':                 'npm:typescript@2.0.3/lib/typescript.js',
      'ng-block-ui':                'npm:ng-block-ui/bundles/umd',
    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        main: './main.ts',
        defaultExtension: 'ts'
      },
      rxjs: {
        defaultExtension: 'js'
      },
      'angular2-in-memory-web-api': {
        main: './index.js',
        defaultExtension: 'js'
      },
      'ng-block-ui': {
        main: 'index.js',
        defaultExtension: 'js'
      },
    }
  });
})(this);


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true
  }
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: 'Helvetica Neue', 'Helvetica';
}

/****************************/
/* BLOCK UI OVERRIDE STYLES */
/****************************/

/* Block UI Wrapper (Backdrop) */
div.block-ui-wrapper {
  background-color: rgba(212, 205, 205, 0.7);
}

/* Spinner */
div.block-ui-wrapper .loader {
  border-color: #fff; /* Circle color */
  border-left-color: #708ada; /* Spinning section in circle color */
}

/* Message */
div.block-ui-spinner .message {
  color: #708ada; /* Loading text color */
}

h1 {
  color: #708ada;
  text-align: center;
  margin-top: 20%;
  font-size: 35px;
}

.control {
  display: block;
  margin: 5px auto;
  padding: 5px;
  background: transparent;
  font-size: 1.7em;
  border: none;
  text-align: center;
}

.control__btn {
  margin: 15px auto;
  padding: 10px 15px;
  font-size: 1.3em;
  background: #708ada;
  color: #fff;
  cursor: pointer;
}

<!-- Wrap app in block-ui component -->
<block-ui>
    <h1>Customized Loading CSS</h1>
    <button class="control control__btn" (click)="toggleBlocking()">
      Start Blocking
    </button>
</block-ui>