Random Numbers

Generate 6 unique random numbers

HTML

<div style="margin-left:20%; width:500px; font-weight:bold; font-size:30px;">

    <button id="generate" style="margin-left:36%">Generate Numbers</button>
    <br><br>
    <div>
      <label style="margin-left:20%">Generate Numbers</label>
      <br>
      <div style="background-color:black">
        <span id="fiveNums" style="margin-left: 10%; width:80%; color:blue;"></span>
        <span id="lastNum" style="color:blue;"></span>
      </div>
    </div>

JavaScript

var btnGen = document.getElementById('generate');
      var fiveNum = document.getElementById('fiveNums');
      var lastNum = document.getElementById('lastNum');

      btnGen.addEventListener('click', function () {
        
        let ranNum;
        
        let firstFive = "";
        let pb = "";
        let oldNum;

        ranNum = GenerateNumbers();

        ranNum.sort(
          (a, b) => {
             if (a < b) {
                 return -1;
             }
             if (a > b) {
              return 1;
               }
             return 0;
             }
         );

         for(let i=0; i<ranNum.length; i++){
           if(i<ranNum.length - 1){

            
               if(ranNum[i].toString().length<2){
                  firstFive += "0" + ranNum[i].toString() + "&nbsp;" + "&nbsp;" + "&nbsp;" + "&nbsp;" + "&nbsp;" + "&nbsp;"
               }else{
                  firstFive += ranNum[i].toString() + "&nbsp;" + "&nbsp;" + "&nbsp;" + "&nbsp;" + "&nbsp;" + "&nbsp;"
               }


           }else{
               if(ranNum[i].toString().length<2){
                  pb = "0" + ranNum[i].toString();
               }else {      
                  pb = ranNum[i].toString(); 
               }

         }

         fiveNum.innerHTML = firstFive;
         lastNum.innerHTML = pb;
         }
        
      });

      function GenerateNumbers() {
        let randomNums = [];
        let selectedNums = [];        
        let newNum = undefined;
        for (let i = 0; i < 6; i++) {

          if (i == 0) {
              newNum = Math.floor(Math.random() * 75) + 1              
              randomNums[i] = newNum;
              selectedNums.push(newNum);
              
          } 
          if (i >0  && i < 5){            
                         
              while (selectedNums.includes(newNum)) {                
                newNum = Math.floor(Math.random() * 75) + 1
              } 
              
              randomNums[i] = newNum;
   ...