diff --git a/src/app/sys-check/network-check/network-check.component.html b/src/app/sys-check/network-check/network-check.component.html
index 5fde64a0296554164683dca2d160d73caab9756c..20b4cabe02d3fcb71b9f6566e4499696c985208f 100644
--- a/src/app/sys-check/network-check/network-check.component.html
+++ b/src/app/sys-check/network-check/network-check.component.html
@@ -1,57 +1,66 @@
 <mat-card>
 
-  <div class="spinner-container" *ngIf="!testDone">
-    <mat-spinner></mat-spinner>
-  </div>
-
   <mat-card-header>
     <mat-card-title>Netzwerk</mat-card-title>
     <mat-card-subtitle>
-      <div *ngIf="!testDone">
-        <p>{{this.status.message}}</p>
-      </div>
+      {{status.message}}
 
-      <div *ngIf="testDone">
+      <span *ngIf="status.done && (networkRating.overallRating !== 'N/A')">
         <span [ngSwitch]="networkRating.overallRating">Ihre Verbindung zum Testserver ist
-          <span *ngSwitchCase="'insufficient'" style="color: red; font-weight: bold;">unzureichend <i class="material-icons">error</i></span>
-          <span *ngSwitchCase="'ok'" style="color: orange; font-weight: bold;">vorauss. ausreichend <i class="material-icons">warning</i></span>
-          <span *ngSwitchCase="'good'" style="color: green; font-weight: bold;">gut <i class="material-icons">check</i></span>
-          <span *ngSwitchCase="'unstable'" style="color: orangered; font-weight: bold;">sehr instabil <i class="material-icons">check</i></span>
-        </span>
-      </div>
+          <span *ngSwitchCase="'insufficient'" style="color: red; font-weight: bold;">unzureichend</span>
+          <span *ngSwitchCase="'ok'" style="color: orange; font-weight: bold;">vorauss. ausreichend</span>
+          <span *ngSwitchCase="'good'" style="color: green; font-weight: bold;">gut</span>
+          <span *ngSwitchCase="'unstable'" style="color: orangered; font-weight: bold;">sehr instabil</span>
+        </span>.
+      </span>
     </mat-card-subtitle>
   </mat-card-header>
 
   <mat-card-content>
 
-
+    <div class="spinner-container-local" *ngIf="!status.done">
+      <mat-spinner></mat-spinner>
+    </div>
 
     <div fxLayout="row">
+
       <div fxFlex="50%">
         <h4>Geschwindigkeit Download</h4>
         <p *ngIf="status.avgDownloadSpeedBytesPerSecond >= 0">&#8960; {{ humanReadableBytes(status.avgDownloadSpeedBytesPerSecond, true) }}ps</p>
         <p *ngIf="status.avgDownloadSpeedBytesPerSecond < 0">Test noch nicht gestartet</p>
         <tc-speed-chart #downloadChart></tc-speed-chart>
       </div>
+
       <div fxFlex="50%">
         <h4>Geschwindigkeit Upload</h4>
         <p *ngIf="status.avgUploadSpeedBytesPerSecond >= 0">&#8960; {{ humanReadableBytes(status.avgUploadSpeedBytesPerSecond, true) }}ps</p>
         <p *ngIf="status.avgUploadSpeedBytesPerSecond < 0">Test noch nicht gestartet</p>
         <tc-speed-chart #uploadChart></tc-speed-chart>
       </div>
+
     </div>
 
+    <mat-divider></mat-divider>
 
-    <div fxLayout="row">
+    <div>
       <h4>Netzwerkeigenschaften</h4>
-      <p *ngIf="!detectedNetworkInformations.available">Ihr Browser ist veraltet, daher konnten keine weiteren Netzwerkeigenschaften ermittelt werden.</p>
-      <p *ngIf="detectedNetworkInformations.available">Verbindung: {{detectedNetworkInformations.effectiveNetworkType}} {{detectedNetworkInformations.networkType}}</p>
-      <p *ngIf="detectedNetworkInformations.roundTripTimeMs">Network RoundTrip: {{detectedNetworkInformations.roundTripTimeMs}} Millisekunden</p>
-      <p *ngIf="detectedNetworkInformations.downlinkMegabitPerSecond">Network Downlink: {{detectedNetworkInformations.downlinkMegabitPerSecond}} mbps</p>
+      <table *ngIf="detectedNetworkInformations.available">
+        <tr>
+          <td>Verbindung</td>
+          <td>{{detectedNetworkInformations.networkType}}</td>
+        </tr>
+        <tr>
+          <td>Network RoundTrip</td>
+          <td>{{detectedNetworkInformations.roundTripTimeMs}}</td>
+        </tr>
+        <tr>
+          <td>Network Downlink: </td>
+          <td>{{detectedNetworkInformations.downlinkMegabitPerSecond}}</td>
+        </tr>
+      </table>
+      <div *ngIf="!detectedNetworkInformations.available">Ihr Browser ist veraltet, daher konnten keine weiteren Netzwerkeigenschaften ermittelt werden.</div>
     </div>
 
-
-
   </mat-card-content>
 
   <mat-card-actions>
diff --git a/src/app/sys-check/network-check/network-check.component.ts b/src/app/sys-check/network-check/network-check.component.ts
index b6236ba2f8016227be878487121b9da8de4060f0..c1eb19157630332d2c34a1f043c10fc08bba4594 100644
--- a/src/app/sys-check/network-check/network-check.component.ts
+++ b/src/app/sys-check/network-check/network-check.component.ts
@@ -15,6 +15,7 @@ interface NetworkCheckStatus {
   message: string;
   avgUploadSpeedBytesPerSecond: number;
   avgDownloadSpeedBytesPerSecond: number;
+  done: boolean;
 }
 
 interface BenchmarkDefinition {
@@ -51,13 +52,13 @@ export class NetworkCheckComponent implements OnInit {
 
   readonly benchmarkDefinitions = new Map<BenchmarkType, BenchmarkDefinition>([
     [BenchmarkType.down, {
-      testSizes: [1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304],
+      testSizes: [1024], //, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304],
       allowedDevianceBytesPerSecond: 100000,
       allowedErrorsPerSequence: 0,
       allowedSequenceRepetitions: 15
     }],
     [BenchmarkType.up, {
-      testSizes: [1024, 4096, 16384, 65536, 262144, 1048576, 4194304],
+      testSizes: [1024],// 4096, 16384, 65536, 262144, 1048576, 4194304],
       allowedDevianceBytesPerSecond: 10000000,
       allowedErrorsPerSequence: 0,
       allowedSequenceRepetitions: 15
@@ -65,11 +66,11 @@ export class NetworkCheckComponent implements OnInit {
   ]);
 
   public status: NetworkCheckStatus = {
+    done: true,
     message: 'Messung noch nicht gestartet',
     avgUploadSpeedBytesPerSecond: -1,
     avgDownloadSpeedBytesPerSecond: -1
   };
-  public testDone = false;
 
   private networkStats = new Map<BenchmarkType, number[]>([
     [BenchmarkType.down, []],
@@ -99,10 +100,9 @@ export class NetworkCheckComponent implements OnInit {
 
   public startCheck() {
 
-    this.testDone = false;
-
     this.status = {
-      message: 'Netzwerk-Analyse wird neu gestartet',
+      done: false,
+      message: 'Netzwerk-Analyse wird gestartet',
       avgUploadSpeedBytesPerSecond: -1,
       avgDownloadSpeedBytesPerSecond: -1
     };
@@ -127,8 +127,8 @@ export class NetworkCheckComponent implements OnInit {
 
     const testSizes = this.benchmarkDefinitions.get(benchmarkType).testSizes;
     const plotterSettings = {
-      css: 'border: 0px solid black; width: 100%; max-width: 400px',
-      width: 400,
+      css: 'border: 1px solid silver; margin: 2px; width: 100%;',
+      width: 800,
       height: 140,
       labelPadding: 4,
       xAxisMaxValue: 16 + Math.max(...testSizes),
@@ -216,10 +216,10 @@ export class NetworkCheckComponent implements OnInit {
     const testRound = this.networkStats.get(benchmarkType).length + 1;
     const testPackage = this.humanReadableBytes(requestSize);
     if (benchmarkType === BenchmarkType.down) {
-      this.updateStatus(`Downloadgeschwindigkeit Testrunde ${testRound} - Testgröße: ${testPackage} bytes`);
+      this.updateStatus(`Downloadgeschwindigkeit Testrunde ${testRound} - Testgröße: ${testPackage}`);
       return this.bs.benchmarkDownloadRequest(requestSize);
     } else {
-      this.updateStatus(`Uploadgeschwindigkeit Testrunde ${testRound} - Testgröße: ${testPackage} bytes)`);
+      this.updateStatus(`Uploadgeschwindigkeit Testrunde ${testRound} - Testgröße: ${testPackage})`);
       return this.bs.benchmarkUploadRequest(requestSize);
     }
   }
@@ -275,7 +275,7 @@ export class NetworkCheckComponent implements OnInit {
     }
 
     this.updateStatus(`Die folgenden Netzwerkeigenschaften wurden festgestellt:`);
-    this.testDone = true;
+    this.status.done = true;
 
     // send data for reporting
     const reportEntry: ReportEntry[] = [];
diff --git a/src/app/sys-check/report/report.component.css b/src/app/sys-check/report/report.component.css
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git a/src/app/sys-check/report/report.component.ts b/src/app/sys-check/report/report.component.ts
index f59a423e3135ce6a84253c1bcce4525119dfe5e4..633dcc786a15fd35cf94a557e2af3d611a447ce9 100644
--- a/src/app/sys-check/report/report.component.ts
+++ b/src/app/sys-check/report/report.component.ts
@@ -4,8 +4,7 @@ import { Component, OnInit } from '@angular/core';
 
 @Component({
   selector: 'iqb-report',
-  templateUrl: './report.component.html',
-  styleUrls: ['./report.component.css']
+  templateUrl: './report.component.html'
 })
 export class ReportComponent implements OnInit {
   reportEnabled = false;
@@ -19,7 +18,7 @@ export class ReportComponent implements OnInit {
   }
 
   ngOnInit() {
-    // this.ds.environmentData$.subscribe(rd => ); too early!
+    // this.ds.environmentData$.subscribe(rd => this.environmentData ); //too early!
     this.ds.networkData$.subscribe(rd => {
       this.networkData = rd;
       this.environmentData = this.ds.environmentData$.getValue();
diff --git a/src/app/sys-check/run.component.css b/src/app/sys-check/run.component.css
index a626628631e388a91b747ba03a12c756ccc62f5d..76a6294bd5f7ac3d57ffc9633f84ccbe4ccff6cd 100644
--- a/src/app/sys-check/run.component.css
+++ b/src/app/sys-check/run.component.css
@@ -2,13 +2,13 @@
   overflow: auto;
 }
 
-.mat-mini-fab {
-  margin-right: 4px
-}
+/*.mat-mini-fab {*/
+/*  margin-right: 4px*/
+/*}*/
 
-.mat-mini-fab[disabled] {
-  background-color: grey;
-}
+/*.mat-mini-fab[disabled] {*/
+/*  background-color: grey;*/
+/*}*/
 
 .fullheight {
   min-height: 90%;
@@ -18,6 +18,10 @@
   margin: 1em;
 }
 
+::ng-deep .mat-card-header-text {
+  margin-left: 0 !important;
+}
+
 /*mat-card-content {*/
 /*  padding: 16px*/
 /*}*/
diff --git a/src/environments/environment.xx.ts b/src/environments/environment.xx.ts
new file mode 100644
index 0000000000000000000000000000000000000000..1af49e5e9ed86b036578c12ac6354f1d4d82d74a
--- /dev/null
+++ b/src/environments/environment.xx.ts
@@ -0,0 +1,21 @@
+
+// This file can be replaced during build by using the `fileReplacements` array.
+// `ng build ---prod` replaces `environment.ts` with `environment.prod.ts`.
+// The list of file replacements can be found in `angular.json`.
+
+export const environment = {
+  production: false,
+  // testcenterUrl: 'https://www.iqb-testcenter.de/',
+  testcenterUrl: 'https://ocba2.iqb.hu-berlin.de/',
+  appName: 'IQB-Testcenter',
+  appPublisher: 'IQB - Institut zur Qualitätsentwicklung im Bildungswesen',
+  appVersion: '0 (dev)'
+};
+
+/*
+ * In development mode, to ignore zone related error stack frames such as
+ * `zone.run`, `zoneDelegate.invokeTask` for easier debugging, you can
+ * import the following file, but please comment it out in production mode
+ * because it will have performance impact when throw error
+ */
+// import 'zone.js/dist/zone-error';  // Included with Angular CLI.
diff --git a/src/styles.css b/src/styles.css
index 68f0965a9e0d7cd0c3c6306955fe2a09f9a8e026..425f0a2812252ae50a50b6cec7b30df624eda1ab 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -36,7 +36,6 @@
   z-index: 999;
   height: 2em;
   width: 2em;
-  overflow: show;
   margin: auto;
   top: 0;
   left: 0;
@@ -44,11 +43,26 @@
   right: 0;
 }
 
+.spinner-container-local {
+  z-index: 999;
+  margin: auto;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  right: 0;
+  text-align: center;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: rgba(0, 0, 0, 0.3);
+  position: absolute;
+}
+
 iframe.unitHost {
   width: 100%;
   background-color: white;
   border: none;
-  margin: 0px;
+  margin: 0;
 }
 
 p.unitMessage {