diff --git a/core.css b/core.css
index cc6f984..2fc9033 100644
--- a/core.css
+++ b/core.css
@@ -32,9 +32,8 @@ main {
 
 .meaning {
   color: #9f9a9a;
-  font-style: italic;
   font-weight: 100;
-  font-size: 1.2rem;
+  font-size: 1rem;
 }
 
 .meaning::before {
diff --git a/src/modules/article/FlowSetup.vue b/src/modules/article/FlowSetup.vue
index b95ecea..e66eeec 100644
--- a/src/modules/article/FlowSetup.vue
+++ b/src/modules/article/FlowSetup.vue
@@ -91,7 +91,8 @@ const feature: Feature = {
       Blue bins are your security stock, to make sure teams can work without any
       blockers. It's to make sure the next team will always have material to
       transform. But it comes with a cost: overburden, stagnation (increase lead
-      time) and duplicated mistakes (not simulated here). The less you have, the
+      time) and duplicated mistakes
+      <span class="meaning">not simulated here</span>. The less you have, the
       less your team has mental charge. The more you have, the more secure you
       are to make teams work. One solution: simplify your flow and lower the
       number of operation the teams have to do to deliver a feature.
diff --git a/src/modules/feature/feature-board.ts b/src/modules/feature/feature-board.ts
index 5554241..c5f57b7 100644
--- a/src/modules/feature/feature-board.ts
+++ b/src/modules/feature/feature-board.ts
@@ -7,6 +7,7 @@ import {
   getMean,
   pickRandomElement,
   popNElement,
+  randomFloat,
   shuffleArray,
   sumElements
 } from '@/utils'
@@ -28,7 +29,7 @@ const hasQualityIssue = ({
   )
 
   const multiplicator = getOverburdenMultiplicator(tasksInParallel)
-  const quality = Math.random()
+  const quality = randomFloat(0, 1)
 
   return quality > qualityProbability / multiplicator
 }
@@ -230,7 +231,7 @@ export const nextDay = (
   state.meta.teamWorkExperience += 0.01
 
   if (strategy === 'problem-solving') {
-    const hasTeamLearned = Math.random() > 0.25
+    const hasTeamLearned = randomFloat(0, 1) > 0.25
     if (hasTeamLearned) {
       state.meta.teamWorkExperience += 1.2
     }
diff --git a/src/modules/feature/feature.fixture.ts b/src/modules/feature/feature.fixture.ts
index 051c2f5..fa07fbf 100644
--- a/src/modules/feature/feature.fixture.ts
+++ b/src/modules/feature/feature.fixture.ts
@@ -1,9 +1,10 @@
 import { birds } from '@/data/bird'
 import { Feature } from '@/modules/feature/feature'
+import { randomInteger } from '@/utils'
 
 export const features: Feature[] = birds.map((name) => ({
   name,
-  complexity: Math.floor(Math.random() * 5) + 1,
+  complexity: randomInteger(1, 5),
   leadTime: 0,
   status: 'doing',
   step: Infinity,
diff --git a/src/utils.ts b/src/utils.ts
index a830c65..b6a43e8 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,3 +1,15 @@
+import { Random } from 'random-js'
+
+const random = new Random()
+
+export const randomInteger = (min: number, max: number) => {
+  return random.integer(min, max)
+}
+
+export const randomFloat = (min: number, max: number) => {
+  return random.real(min, max)
+}
+
 export const getMean = (data: number[]) =>
   Math.round(100 * (sumElements(data) / data.length)) / 100
 
@@ -11,7 +23,7 @@ export const shuffleArray = <T>(array: T[]) => {
     randomIndex
 
   while (currentIndex !== 0) {
-    randomIndex = Math.floor(Math.random() * currentIndex)
+    randomIndex = randomInteger(0, currentIndex - 1)
     currentIndex--
     ;[array[currentIndex], array[randomIndex]] = [
       array[randomIndex],
@@ -37,7 +49,7 @@ export const popNElement = <T>(array: T[], numberOfElements: number) => {
 }
 
 export const pickRandomIndex = <T>(array: T[]) =>
-  Math.floor(Math.random() * array.length)
+  randomInteger(0, array.length - 1)
 
 export const pickRandomElement = <T>(array: T[]) =>
   array[pickRandomIndex(array)]