diff --git a/packages/app/components/ui/bsod/BSoD.story.tsx b/packages/app/components/ui/bsod/BSoD.story.tsx
new file mode 100644
index 0000000..332c1fa
--- /dev/null
+++ b/packages/app/components/ui/bsod/BSoD.story.tsx
@@ -0,0 +1,6 @@
+import React from 'react';
+import { storiesOf } from '@storybook/react';
+
+import BSoD from './BSoD';
+
+storiesOf('UI', module).add('BSoD', () => <BSoD />);
diff --git a/packages/app/components/ui/bsod/BSoD.tsx b/packages/app/components/ui/bsod/BSoD.tsx
index 3cd2397..bd3bdca 100644
--- a/packages/app/components/ui/bsod/BSoD.tsx
+++ b/packages/app/components/ui/bsod/BSoD.tsx
@@ -1,72 +1,56 @@
-import React from 'react';
+import React, { ComponentType } from 'react';
 import { FormattedMessage as Message } from 'react-intl';
-import logger from 'app/services/logger';
+
 import appInfo from 'app/components/auth/appInfo/AppInfo.intl.json';
 
-import styles from './styles.scss';
 import BoxesField from './BoxesField';
+
+import styles from './styles.scss';
 import messages from './BSoD.intl.json';
 
 interface State {
   lastEventId?: string | void;
 }
 
-// TODO: probably it is better to render this view from the App view
-// to remove dependencies from store and IntlProvider
-class BSoD extends React.Component<{}, State> {
-  state: State = {};
-
-  componentDidMount() {
-    // poll for event id
-    const timer = setInterval(() => {
-      if (!logger.getLastEventId()) {
-        return;
-      }
-
-      clearInterval(timer);
-
-      this.setState({
-        lastEventId: logger.getLastEventId(),
-      });
-    }, 500);
-  }
-
-  render() {
-    const { lastEventId } = this.state;
-
-    let emailUrl = 'mailto:support@ely.by';
-
-    if (lastEventId) {
-      emailUrl += `?subject=Bug report for #${lastEventId}`;
-    }
-
-    return (
-      <div className={styles.body}>
-        <canvas
-          className={styles.canvas}
-          ref={(el: HTMLCanvasElement | null) => el && new BoxesField(el)}
-        />
-
-        <div className={styles.wrapper}>
-          <div className={styles.title}>
-            <Message {...appInfo.appName} />
-          </div>
-          <div className={styles.lineWithMargin}>
-            <Message {...messages.criticalErrorHappened} />
-          </div>
-          <div className={styles.line}>
-            <Message {...messages.reloadPageOrContactUs} />
-          </div>
-          <a href={emailUrl} className={styles.support}>
-            support@ely.by
-          </a>
-          <div className={styles.easterEgg}>
-            <Message {...messages.alsoYouCanInteractWithBackground} />
-          </div>
-        </div>
-      </div>
-    );
-  }
+interface Props {
+  lastEventId?: string;
 }
 
+// TODO: probably it's better to render this view from the App view
+//       to remove dependencies from the store and IntlProvider
+const BSoD: ComponentType<Props> = ({ lastEventId }) => {
+  let emailUrl = 'mailto:support@ely.by';
+
+  if (lastEventId) {
+    emailUrl += `?subject=Bug report for #${lastEventId}`;
+  }
+
+  return (
+    <div className={styles.body}>
+      <canvas
+        className={styles.canvas}
+        ref={(el: HTMLCanvasElement | null) => el && new BoxesField(el)}
+      />
+
+      <div className={styles.wrapper}>
+        <div className={styles.title}>
+          <Message {...appInfo.appName} />
+        </div>
+        <div className={styles.lineWithMargin}>
+          <Message {...messages.criticalErrorHappened} />
+        </div>
+        <div className={styles.line}>
+          <Message {...messages.reloadPageOrContactUs} />
+        </div>
+        <a href={emailUrl} className={styles.support}>
+          support@ely.by
+        </a>
+        <div className={styles.easterEgg}>
+          <Message {...messages.alsoYouCanInteractWithBackground} />
+        </div>
+      </div>
+    </div>
+  );
+};
+
 export default BSoD;
diff --git a/packages/app/components/ui/bsod/BSoDContainer.tsx b/packages/app/components/ui/bsod/BSoDContainer.tsx
new file mode 100644
index 0000000..422b895
--- /dev/null
+++ b/packages/app/components/ui/bsod/BSoDContainer.tsx
@@ -0,0 +1,29 @@
+import React, { ComponentType, useEffect, useState } from 'react';
+
+import logger from 'app/services/logger/logger';
+
+import BSoD from './BSoD';
+
+const BSoDContainer: ComponentType = () => {
+  const [lastEventId, setLastEventId] = useState<string>();
+  useEffect(() => {
+    const timer = setInterval(() => {
+      // eslint-disable-next-line no-shadow
+      const lastEventId = logger.getLastEventId();
+
+      if (!lastEventId) {
+        return;
+      }
+
+      clearInterval(timer);
+      setLastEventId(lastEventId);
+    }, 500);
+
+    // Don't care about interval cleanup because there is no way from
+    // BSoD state and page can be only reloaded
+  }, []);
+
+  return <BSoD lastEventId={lastEventId} />;
+};
+
+export default BSoDContainer;
diff --git a/packages/app/components/ui/bsod/Box.js b/packages/app/components/ui/bsod/Box.js
deleted file mode 100644
index ed04b6d..0000000
--- a/packages/app/components/ui/bsod/Box.js
+++ /dev/null
@@ -1,100 +0,0 @@
-export default class Box {
-  constructor({ size, startX, startY, startRotate, color, shadowColor }) {
-    this.color = color;
-    this.shadowColor = shadowColor;
-    this.halfSize = 0;
-    this.setSize(size);
-    this.x = startX;
-    this.y = startY;
-    this.angle = startRotate;
-    this.shadowLength = 2000; // TODO: should be calculated
-  }
-
-  get size() {
-    return this._initialSize;
-  }
-
-  get dots() {
-    const full = (Math.PI * 2) / 4;
-
-    const p1 = {
-      x: this.x + this.halfSize * Math.sin(this.angle),
-      y: this.y + this.halfSize * Math.cos(this.angle),
-    };
-
-    const p2 = {
-      x: this.x + this.halfSize * Math.sin(this.angle + full),
-      y: this.y + this.halfSize * Math.cos(this.angle + full),
-    };
-
-    const p3 = {
-      x: this.x + this.halfSize * Math.sin(this.angle + full * 2),
-      y: this.y + this.halfSize * Math.cos(this.angle + full * 2),
-    };
-
-    const p4 = {
-      x: this.x + this.halfSize * Math.sin(this.angle + full * 3),
-      y: this.y + this.halfSize * Math.cos(this.angle + full * 3),
-    };
-
-    return { p1, p2, p3, p4 };
-  }
-
-  rotate() {
-    const speed = (60 - this.halfSize) / 20;
-    this.angle += speed * 0.002;
-    this.x += speed;
-    this.y += speed;
-  }
-
-  draw(ctx) {
-    const { dots } = this;
-    ctx.beginPath();
-    ctx.moveTo(dots.p1.x, dots.p1.y);
-    ctx.lineTo(dots.p2.x, dots.p2.y);
-    ctx.lineTo(dots.p3.x, dots.p3.y);
-    ctx.lineTo(dots.p4.x, dots.p4.y);
-    ctx.fillStyle = this.color;
-    ctx.fill();
-  }
-
-  drawShadow(ctx, light) {
-    const { dots } = this;
-    const angles = [];
-    const points = [];
-
-    for (const i in dots) {
-      if (!dots.hasOwnProperty(i)) {
-        continue;
-      }
-
-      const dot = dots[i];
-      const angle = Math.atan2(light.y - dot.y, light.x - dot.x);
-      const endX = dot.x + this.shadowLength * Math.sin(-angle - Math.PI / 2);
-      const endY = dot.y + this.shadowLength * Math.cos(-angle - Math.PI / 2);
-      angles.push(angle);
-      points.push({
-        endX,
-        endY,
-        startX: dot.x,
-        startY: dot.y,
-      });
-    }
-
-    for (let i = points.length - 1; i >= 0; i--) {
-      const n = i === 3 ? 0 : i + 1;
-      ctx.beginPath();
-      ctx.moveTo(points[i].startX, points[i].startY);
-      ctx.lineTo(points[n].startX, points[n].startY);
-      ctx.lineTo(points[n].endX, points[n].endY);
-      ctx.lineTo(points[i].endX, points[i].endY);
-      ctx.fillStyle = this.shadowColor;
-      ctx.fill();
-    }
-  }
-
-  setSize(size) {
-    this._initialSize = size;
-    this.halfSize = Math.floor(size / 2);
-  }
-}
diff --git a/packages/app/components/ui/bsod/Box.ts b/packages/app/components/ui/bsod/Box.ts
new file mode 100644
index 0000000..5fa9726
--- /dev/null
+++ b/packages/app/components/ui/bsod/Box.ts
@@ -0,0 +1,119 @@
+import Point from './Point';
+
+const shadowLength = 2000; // TODO: should be calculated
+
+export default class Box {
+  public position: Point;
+  private angle: number;
+  public color: string;
+  private readonly shadowColor: string;
+
+  private _size: number;
+  private _halfSize: number;
+
+  constructor(
+    size: number,
+    position: Point,
+    startRotate: number,
+    color: string,
+    shadowColor: string,
+  ) {
+    this.size = size;
+    this.position = position;
+    this.color = color;
+    this.angle = startRotate;
+    this.shadowColor = shadowColor;
+  }
+
+  public get size(): number {
+    return this._size;
+  }
+
+  public set size(size: number) {
+    this._size = size;
+    this._halfSize = Math.floor(size / 2);
+  }
+
+  public get halfSize(): number {
+    return this._halfSize;
+  }
+
+  get points(): { p1: Point; p2: Point; p3: Point; p4: Point } {
+    const full = (Math.PI * 2) / 4;
+
+    const p1: Point = {
+      x: this.position.x + this._halfSize * Math.sin(this.angle),
+      y: this.position.y + this._halfSize * Math.cos(this.angle),
+    };
+
+    const p2: Point = {
+      x: this.position.x + this._halfSize * Math.sin(this.angle + full),
+      y: this.position.y + this._halfSize * Math.cos(this.angle + full),
+    };
+
+    const p3: Point = {
+      x: this.position.x + this._halfSize * Math.sin(this.angle + full * 2),
+      y: this.position.y + this._halfSize * Math.cos(this.angle + full * 2),
+    };
+
+    const p4: Point = {
+      x: this.position.x + this._halfSize * Math.sin(this.angle + full * 3),
+      y: this.position.y + this._halfSize * Math.cos(this.angle + full * 3),
+    };
+
+    return { p1, p2, p3, p4 };
+  }
+
+  rotate(): void {
+    const speed = (60 - this._halfSize) / 20;
+    this.angle += speed * 0.002;
+    this.position.x += speed;
+    this.position.y += speed;
+  }
+
+  draw(ctx: CanvasRenderingContext2D): void {
+    const { points } = this;
+    ctx.beginPath();
+    ctx.moveTo(points.p1.x, points.p1.y);
+    ctx.lineTo(points.p2.x, points.p2.y);
+    ctx.lineTo(points.p3.x, points.p3.y);
+    ctx.lineTo(points.p4.x, points.p4.y);
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+
+  drawShadow(ctx: CanvasRenderingContext2D, light: Point): void {
+    const boxPoints = this.points;
+    const points: Array<{
+      startX: number;
+      startY: number;
+      endX: number;
+      endY: number;
+    }> = [];
+
+    // eslint-disable-next-line guard-for-in
+    for (const i in boxPoints) {
+      const point = boxPoints[i];
+      const angle = Math.atan2(light.y - point.y, light.x - point.x);
+      const endX = point.x + shadowLength * Math.sin(-angle - Math.PI / 2);
+      const endY = point.y + shadowLength * Math.cos(-angle - Math.PI / 2);
+      points.push({
+        startX: point.x,
+        startY: point.y,
+        endX,
+        endY,
+      });
+    }
+
+    for (let i = points.length - 1; i >= 0; i--) {
+      const n = i === 3 ? 0 : i + 1;
+      ctx.beginPath();
+      ctx.moveTo(points[i].startX, points[i].startY);
+      ctx.lineTo(points[n].startX, points[n].startY);
+      ctx.lineTo(points[n].endX, points[n].endY);
+      ctx.lineTo(points[i].endX, points[i].endY);
+      ctx.fillStyle = this.shadowColor;
+      ctx.fill();
+    }
+  }
+}
diff --git a/packages/app/components/ui/bsod/BoxesField.js b/packages/app/components/ui/bsod/BoxesField.ts
similarity index 67%
rename from packages/app/components/ui/bsod/BoxesField.js
rename to packages/app/components/ui/bsod/BoxesField.ts
index 7c279ca..c2870b3 100644
--- a/packages/app/components/ui/bsod/BoxesField.js
+++ b/packages/app/components/ui/bsod/BoxesField.ts
@@ -1,16 +1,34 @@
+import Point from './Point';
 import Box from './Box';
 
+interface Params {
+  countBoxes: number;
+  boxMinSize: number;
+  boxMaxSize: number;
+  backgroundColor: string;
+  lightColor: string;
+  shadowColor: string;
+  boxColors: ReadonlyArray<string>;
+}
+
 /**
- * Основано на http://codepen.io/mladen___/pen/gbvqBo
+ * Based on http://codepen.io/mladen___/pen/gbvqBo
  */
 export default class BoxesField {
+  private readonly elem: HTMLCanvasElement;
+  private readonly ctx: CanvasRenderingContext2D;
+  private readonly params: Params;
+
+  private light: Point;
+  private boxes: Array<Box>;
+
   /**
    * @param {HTMLCanvasElement} elem - canvas DOM node
    * @param {object} params
    */
   constructor(
-    elem,
-    params = {
+    elem: HTMLCanvasElement,
+    params: Params = {
       countBoxes: 14,
       boxMinSize: 20,
       boxMaxSize: 75,
@@ -31,7 +49,7 @@ export default class BoxesField {
     const ctx = elem.getContext('2d');
 
     if (!ctx) {
-      throw new Error('Can not get canvas 2d context');
+      throw new Error('Cannot get canvas 2d context');
     }
 
     this.ctx = ctx;
@@ -46,35 +64,34 @@ export default class BoxesField {
     this.drawLoop();
     this.bindWindowListeners();
 
-    /**
-     * @type {Box[]}
-     */
     this.boxes = [];
 
     while (this.boxes.length < this.params.countBoxes) {
       this.boxes.push(
-        new Box({
-          size: Math.floor(
+        new Box(
+          Math.floor(
             Math.random() * (this.params.boxMaxSize - this.params.boxMinSize) +
               this.params.boxMinSize,
           ),
-          startX: Math.floor(Math.random() * elem.width + 1),
-          startY: Math.floor(Math.random() * elem.height + 1),
-          startRotate: Math.random() * Math.PI,
-          color: this.getRandomColor(),
-          shadowColor: this.params.shadowColor,
-        }),
+          {
+            x: Math.floor(Math.random() * elem.width + 1),
+            y: Math.floor(Math.random() * elem.height + 1),
+          },
+          Math.random() * Math.PI,
+          this.getRandomColor(),
+          this.params.shadowColor,
+        ),
       );
     }
   }
 
-  resize() {
+  resize(): void {
     const { width, height } = this.elem.getBoundingClientRect();
     this.elem.width = width;
     this.elem.height = height;
   }
 
-  drawLight(light) {
+  drawLight(light: Point): void {
     const greaterSize =
       window.screen.width > window.screen.height
         ? window.screen.width
@@ -98,7 +115,7 @@ export default class BoxesField {
     this.ctx.fill();
   }
 
-  drawLoop() {
+  drawLoop(): void {
     this.ctx.clearRect(0, 0, this.elem.width, this.elem.height);
     this.drawLight(this.light);
 
@@ -120,14 +137,20 @@ export default class BoxesField {
       const box = this.boxes[i];
       box.draw(this.ctx);
 
-      // Если квадратик вылетел за пределы экрана
-      if (box.y - box.halfSize > this.elem.height) {
-        box.y -= this.elem.height + 100;
-        this.updateBox(box);
+      // When box leaves window boundaries
+      let shouldUpdateBox = false;
+
+      if (box.position.y - box.halfSize > this.elem.height) {
+        box.position.y -= this.elem.height + 100;
+        shouldUpdateBox = true;
       }
 
-      if (box.x - box.halfSize > this.elem.width) {
-        box.x -= this.elem.width + 100;
+      if (box.position.x - box.halfSize > this.elem.width) {
+        box.position.x -= this.elem.width + 100;
+        shouldUpdateBox = true;
+      }
+
+      if (shouldUpdateBox) {
         this.updateBox(box);
       }
     }
@@ -143,14 +166,11 @@ export default class BoxesField {
     });
   }
 
-  /**
-   * @param {Box} box
-   */
-  updateBox(box) {
+  updateBox(box: Box): void {
     box.color = this.getRandomColor();
   }
 
-  getRandomColor() {
+  getRandomColor(): string {
     return this.params.boxColors[
       Math.floor(Math.random() * this.params.boxColors.length)
     ];
diff --git a/packages/app/components/ui/bsod/Point.ts b/packages/app/components/ui/bsod/Point.ts
new file mode 100644
index 0000000..6ebe393
--- /dev/null
+++ b/packages/app/components/ui/bsod/Point.ts
@@ -0,0 +1,4 @@
+export default interface Point {
+  x: number;
+  y: number;
+}
diff --git a/packages/app/components/ui/bsod/actions.js b/packages/app/components/ui/bsod/actions.js
deleted file mode 100644
index f4010f9..0000000
--- a/packages/app/components/ui/bsod/actions.js
+++ /dev/null
@@ -1,10 +0,0 @@
-export const BSOD = 'BSOD';
-
-/**
- * @returns {object}
- */
-export function bsod() {
-  return {
-    type: BSOD,
-  };
-}
diff --git a/packages/app/components/ui/bsod/actions.ts b/packages/app/components/ui/bsod/actions.ts
new file mode 100644
index 0000000..2128074
--- /dev/null
+++ b/packages/app/components/ui/bsod/actions.ts
@@ -0,0 +1,9 @@
+import { Action } from 'redux';
+
+export const BSOD = 'BSOD';
+
+export function bsod(): Action {
+  return {
+    type: BSOD,
+  };
+}
diff --git a/packages/app/components/ui/bsod/dispatchBsod.tsx b/packages/app/components/ui/bsod/dispatchBsod.tsx
index e76b293..0cb12c1 100644
--- a/packages/app/components/ui/bsod/dispatchBsod.tsx
+++ b/packages/app/components/ui/bsod/dispatchBsod.tsx
@@ -5,7 +5,7 @@ import { Store } from 'app/reducers';
 import { History } from 'history';
 
 import { bsod } from './actions';
-import BSoD from './BSoD';
+import BSoDContainer from './BSoDContainer';
 
 let injectedStore: Store;
 let injectedHistory: History<any>;
@@ -20,7 +20,7 @@ export default function dispatchBsod(
 
   ReactDOM.render(
     <ContextProvider store={store} history={history}>
-      <BSoD />
+      <BSoDContainer />
     </ContextProvider>,
     document.getElementById('app'),
   );
diff --git a/packages/app/components/ui/bsod/styles.scss b/packages/app/components/ui/bsod/styles.scss
index ca38ca0..d9ff3fb 100644
--- a/packages/app/components/ui/bsod/styles.scss
+++ b/packages/app/components/ui/bsod/styles.scss
@@ -1,7 +1,6 @@
 @import '~app/components/ui/colors.scss';
 
-$font-family-monospaced: 'Consolas', 'Menlo', 'DejaVu Sans Mono', 'Roboto Mono',
-  monospace;
+$font-family-monospaced: 'Consolas', 'Menlo', 'DejaVu Sans Mono', 'Roboto Mono', monospace;
 
 .body {
   height: 100%;
@@ -46,9 +45,16 @@ $font-family-monospaced: 'Consolas', 'Menlo', 'DejaVu Sans Mono', 'Roboto Mono',
 
 .support {
   font-size: 18px;
+  line-height: 18px;
   color: #fff;
-  margin: 3px 0 44px;
-  display: block;
+  margin: 5px 0 44px;
+  display: inline-block;
+  border-bottom-color: #39777f;
+
+  &:hover {
+    color: #fff;
+    border-bottom-color: #eee;
+  }
 }
 
 .easterEgg {