JSFiddle - React, Tailwind, and code Playground

HTML

<head>
        
        <title>Merkspiel von Lars</title>
        
        <meta http-equiv="content-type" content="text/html; charset=utf-8">
   </head>
   
   <body>
        
     <div id="titel">
        <h1 id="titelText">Merk dir das!</h1>
     </div>
        
     <div id="options">
        <label id="selectLabel" for="circleNumber">Anzahl der Kreise:</label>
        <select id="circleNumber" onchange="arrangeCircle()">
            <option value="1">Eins</option>
            <option value="2">Zwei</option>
            <option value="3">Drei</option>
            <option value="4">Vier</option>
            <option value="5">Fünf</option>
            <option value="6">Sechs</option>
            <option value="7">Sieben</option>
            <option value="8">Acht</option>
            <option value="9">Neun</option>                       
        </select>
     </div>
     <div id="circleToArrange"></div>
     <div id="smallDiv1" class="smallCircle">
        <span id="number1" class="number">1</span>
     </div>
        <div id="smallDiv2" class="smallCircle">
            <p id="number2" class="number">2</p>
        </div>
        <div id="smallDiv3" class="smallCircle">
            <p id="number3" class="number">3</p>
        </div>
        <div id="smallDiv4" class="smallCircle">
            <p id="number4" class="number">4</p>
        </div>
        <div id="smallDiv5" class="smallCircle">
            <p id="number5" class="number">5</p>
        </div>
        <div id="smallDiv6" class="smallCircle">
            <p id="number6" class="number">6</p>
        </div>
        <div id="smallDiv7" class="smallCircle">
            <p id="number7" class="number">7</p>
        </div>
        <div id="smallDiv8" class="smallCircle">
            <p id="number8" class="number">8</p>
        </div>
        <div id="smallDiv9" class="smallCircle">
            <p id="number9" class="number">9</p>
        </div>        
        <div id="displayDiv">
            <button...

CSS

body{
                
                margin: 0px;
                padding: 0px;
            }
            
            #titel{
                position:relative;
                width: 100%;
                height:75px;
                background-color: aquamarine;
                
            }
            
            #titelText {
                position: relative;
                margin-top: 10px;
                margin-left: 200px;
                font-size: 300%;
            }
            
            #options{
                position: absolute;
                top: 100px;
                width: 100%;
                height: 100px;
                background-color: cornsilk;
            }
            
            #selectLabel{
                position: relative;
                margin-left: 20px;
                font-size: 25px;
            }
            
            
            #displayDiv{
                position: relative;
                background-color: azure;
                top: 200px;
                width: 150px;
                height: 200px;
                margin: 10px;
                
                
                
            }
            
            #circleNumber, #circleNumberLabel{
                
                margin-left: 10px;
                font-size: 100%;
            }
            
            #circleToArrange{
                
                position: absolute;
                top: 300px;
                left: 400px;
                width: 400px;
                height: 400px;
                background-color: cornsilk;
                border-radius: 50%;
                
            }
            
            .smallCircle{
                
                position: absolute;
                
                left: 20px;
                top: 200px;
                width: 50px;
                height: 50px;
                background-color: red;
                border-radius: 50%;
            }

            
          ...

JavaScript

let numberOfDiv;
        let posSmallCircle = {x_position:0, y_position:0};      /* Kreiseposition */
        let premadeObjects = [];                                /* Vorgemachte Objekte */
        let counterfeitObjects = [];                            /* Nachgemachte Objekte */
        let pretendOrImitate = true;                                     /* ob vormachen oder nachmachen */
        let newObject = false;
        let endGame = false;
        
        /* Funktionsaufruf, um die Kreise unsichtbar zu machen */
        unvisible();
          
        
        /*
        #
        # Spielt starten
        ##################################*/   
        function gameStart(){
                
            if(pretendOrImitate==true){                
                
                if(premadeObjects.length==0){
                    pretend(true,0);
                }else{
                    for (let i=0; i < premadeObjects.length; i++) {
                        let arrayContent = parseInt(premadeObjects[i]);
                        console.log("Array - Inhalt: " + arrayContent);
                        pretend(false,arrayContent);
                    } 
                    pretend(true,0);    
                }
                
            }else{
                imitate();
            }                   
        }
        
        function pretend(newObject,number){
            
                console.log("Number am anfang: " + number);
            
                /*   1. Zufallszahl zwischen 1 und gewählte Anzahl     */
                let element = document.getElementById('circleNumber');

                /* Anzahl der Kreise aus der Klappbox */
                let numberOfCircle = element.options[element.selectedIndex].value;

                /* Zufallszahl zwischen 1 und gewählte Anzahl aus der Klappbox */
                
                if (newObject == false){
                    numberOfDiv = number;
                    
                }else{
     ...