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Accessing a Sections background property

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I am trying to access the background property of a specific section. In this case, I want to access the background property on the left section of my page. There is currently a placeholder image that I have set up, but I want that image to change if the user presses on a button on the right side. 
 

This is the current code I have on the button titled "Model 2" . When I click on the Model 2 button, I get no error in the browser console, and it seems to be that the background image only turns a bit dark. 

 

I am not sure if im just not accessing the right ID for the section, or if im doing something wrong. Using ID finder, the ID for the left section is: section[data-section-id="6642cac4e9abab7cc0dd30e9"]. I have also querySelecting this into the mainSection but the console would output that the id couldnt be found. 

I simply just need to be able to access the DOM element that will allow me to change the background image of that section.
 

<button id='model-2-button'>Model 2</button>

<script>
        document.addEventListener('DOMContentLoaded', function() {
            const buttonTwo = document.querySelector('#model-2-button');
            const mainSection = document.querySelector('.section-border');

            buttonTwo.addEventListener('click', function(event){
                event.preventDefault();

                buttonTwo.textContent = "Button clicked";
                if (mainSection) {
                    const mainSectionImg = mainSection.querySelector('.section-background img');
                    if (mainSectionImg) {
                        // Adding a cache-busting query parameter to force image reload
                        const newSrc = 'https://images.squarespace-cdn.com/content/v1/5e4b3cfd445a6a5feb18f718/88a13f9c-57b4-4ffa-98e6-712593ba556d/test1.jpg?timestamp=' + new Date().getTime();
                        mainSectionImg.src = newSrc;

                        // Force reload by removing and re-adding the image
                        const parent = mainSectionImg.parentNode;
                        parent.removeChild(mainSectionImg);
                        parent.appendChild(mainSectionImg);
                    } else {
                        console.error('Image element not found in the targeted section');
                    }
                } else {
                    console.error('Section with class "section-border" not found');
                }
            });
        });
</script>

<style>

  #model-2-button {
  color: black;
  background: white;
  border: 1px solid rgb(225, 222, 218);
  cursor: pointer;
  border-radius: 15px;
  transition: border 0.5s ease 0s;
  padding: 12px 40px;
  width: 327px;
  }

  #model-2-button:hover {
    border-color: black;
  }

  
</style>

 

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