Overflow-x cuts off objects moving in Y axis

const submitButton = document.querySelector('.submit');
const backButton = document.querySelector('.back');
const inputSection = document.getElementById('input-section');
const simulationSection = document.getElementById('simulation');
let floorNos = document.getElementById('floors');
let liftNos = document.getElementById('lifts');


function clearContent() {
    while (simulationSection.firstChild) {
        simulationSection.removeChild(simulationSection.firstChild);
    }
}

submitButton.addEventListener('click', () => {
    let errorMessage = '';
    let n = parseInt(floorNos.value);
    let m = parseInt(liftNos.value);

    if (isNaN(n) || n < 1) {
        errorMessage += 'Invalid Floor Input.n';
    }
    if (isNaN(m) || m < 1) {
        errorMessage += 'Invalid Lift Input.n';
    }

    if (errorMessage) {
        alert(errorMessage);
    } else {
        const newSimLiftsContainer = document.createElement('div');
        newSimLiftsContainer.id = 'sim-lifts';


        for (let i = 0; i < n; i++) {
            const floorDiv = document.createElement('div');
            floorDiv.classList.add('sim-floors');

            const buttonContainer = document.createElement('div');
            buttonContainer.classList.add('button-container');

            const upButton = document.createElement('button');
            upButton.classList.add('up');
            upButton.textContent = 'Up';
            const downButton = document.createElement('button');
            downButton.classList.add('down');
            downButton.textContent = 'Down';

            if (i === n - 1) upButton.style.display = 'none';
            if (i === 0) downButton.style.display = 'none';

            buttonContainer.appendChild(upButton);
            buttonContainer.appendChild(downButton);

            const floorContainer = document.createElement('div');
            floorContainer.classList.add('floor-container');

            const line = document.createElement('div');
            line.classList.add('line');

            const floorNo = document.createElement('div');
            floorNo.classList.add('floor-no');
            floorNo.textContent = `Floor ${i + 1}`; 

            floorContainer.appendChild(line);
            floorContainer.appendChild(floorNo);

            floorDiv.appendChild(buttonContainer);
            floorDiv.appendChild(floorContainer);

            simulationSection.appendChild(floorDiv);


            if (i === 0) {
                for (let j = 0; j < m; j++) {
                    const lift = document.createElement('div');
                    lift.classList.add('lift');

                    const liftDoorLeft = document.createElement('div');
                    liftDoorLeft.classList.add('lift-door-left');

                    const liftDoorRight = document.createElement('div');
                    liftDoorRight.classList.add('lift-door-right');

                    lift.appendChild(liftDoorLeft);
                    lift.appendChild(liftDoorRight);

                    newSimLiftsContainer.appendChild(lift);
                }

                floorDiv.appendChild(newSimLiftsContainer);
            }
        }
        newSimLiftsContainer.scrollLeft = newSimLiftsContainer.scrollWidth;
        inputSection.style.display = 'none';
        simulationSection.style.display = 'flex';
        backButton.style.display = 'block';

        newSimLiftsContainer.addEventListener('wheel', (e) => {
        e.preventDefault();
        newSimLiftsContainer.scrollLeft += e.deltaY;

        });
    }
});

backButton.addEventListener('click', () => {
    clearContent();
    simulationSection.style.display = 'none';
    inputSection.style.display = 'flex';
    backButton.style.display = 'none';
});

/*For Input*/
#simulation {
  display:none;
}
.back{
  display:none;
}
#input-section,
#simulation {
  width: 100%;
  height: 100%;
}

#input-section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.input {
  margin: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font: bold larger Arial, Helvetica, sans-serif;
  padding-top: 200px;
}

#floors {
  margin-bottom: 100px;
}

.button{
  margin-top: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.submit{
  cursor:pointer;
  height:60px;
  width:120px;
  background-color:rgb(251, 251, 251);
  border-radius: 10px;
  border: 1px solid black;
}

.submit:hover{
  background-color:rgb(177, 177, 177);
}

.submit:active{
  background-color:rgb(126, 128, 128);
}

#floors,#lifts{
  width:190px;
  border-radius:5px;
  border: 1px solid black;
}

/*For Simulation*/

#simulation {
  font: bold larger Arial, Helvetica, sans-serif;
  display: flex;
  flex-direction: column-reverse;
  gap: 50px;
}

.sim-floors {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  height: 150px;
}

.sim-floors:last-child {
  margin-top: 100px;
}

.button-container {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-top: 40px;
  width: 80px;
  z-index: 1;
}


.floor-container {
  display: flex;
  align-items: center;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.line {
  flex-grow: 1;
  border-top: 4px solid black;
  margin: 0 10px;
}

.floor-no {
  text-align: right;
  font-size: 18px;
  margin-top: 3px;
}

.up, .down {
  font-weight: 800;
  border-radius: 10px;
  border: none;
  padding: 10px 20px;
  margin-bottom: 3px;
  cursor: pointer;
  display: flex;
}

.up {
  background: #00b300;
  color: black;
}

.up:hover {
  background: #00b3009a;
}

.up:active{
  background: #00b300e0;
}

.down {
  background: #ffcc00;
  color: black;
}

.down:hover{
  background: #ffcc00a4;
}

.down:active{
  background: #ffcc00d2;
}

#sim-lifts {
  position: relative;
  display: flex;
  white-space: nowrap;
  max-width: 90.3%; 
  margin-left: 90px;
  padding-top: 60px;
  scrollbar-width: none;

}

#sim-lifts::-webkit-scrollbar {
  display: none;
}

.lift {
  z-index: 100;
  animation: moveUp 10s infinite;
  min-width: 60px;
  flex-shrink: 0;
  height: 75px;
  background: rgb(0, 153, 255);
  position: relative;
  margin: 0 5px;
  overflow-x: hidden;
}

.back{
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 600;
  position:absolute;
  top:10px;
  right:10px;
  float:right;
  background:rgba(60, 0, 255, 0.522);
  padding: 7px;
  border-radius: 10px;
  border:none;
  padding-top:10px;
  padding-bottom:10px;
  cursor:pointer;
}

.back:hover{
  background: rgba(60, 0, 255, 0.381);
}

.back:active{
  background: rgba(60, 0, 255, 0.474);
}

.lift-door-left,
.lift-door-right {
  width: 50%;
  height: 100%;
  position: absolute;
}
.lift-door-left {
  background: silver;
  border-right: 1.5px solid black;
  left:0;
  animation: ldoor 5s;
}
.lift-door-right {
  background: silver;
  border-left: 1.5px solid black;
  right:0;
  animation: rdoor 5s;
}

@keyframes ldoor{
  0%{left:0;}
  50%{left:-50%;}
  100%{left:0;}
}

@keyframes rdoor{
  0%{right:0;}
  50%{right:-50%;}
  100%{right:0;}
}

@keyframes moveUp{
  0%{transform: translateY(0px);}
  50%{transform: translateY(-200px);}
  100%{transform: translateY(0px);}
}

<div id="input-section">  
  <div class="input">
    <div>
      Enter the no. of Floors: <br><br>
    </div>
    <input id="floors" style="font-size:16pt;" type="number" placeholder="Enter the no. of floors"/>
    <div>
      Enter the no. of Lifts: <br><br>
    </div>
    <input id="lifts" style="font-size:16pt;" type="number" placeholder="Enter the no. of lifts"/>
  </div>
  <div class="button">
  <button class="submit" style="font-size:16pt;">Submit</button>
  </div>
</div>

<div>
  <button class="back" style="font-size:16pt;">GO BACK</button>
</div>

<div id="simulation"></div>