How to do parallax using pure css or js

HTML-CSS
1

hi i am new to css and i am trying to do a parallax scrolling with the 1920x750 image size. I try with background-attachment: fixed; & transform: translateZ(-300px) scale(2); it will larger my image size. i wanted to use my original banner size to do parallax scrolling

can refer to this Edit fiddle - JSFiddle - Code Playground

<div class="sections">
  
<section class="section1">
      <div class="banner_img">
        <img src="https://commonbond.org/wp-content/uploads/2023/10/open-doors-banner-2.jpg"/>
        <div class="content">
          <h1>This is a testing image</h1>
        </div>
      </div>
    </section>
    <section class="section2">
      <div class="banner_img">
        <img src="https://static.elite-wheels.com/wp-content/uploads/2023/02/2023.2-MTBBanner.webp"/>
     
    <div class="content2">
          <h1>This is a testing image</h1>
        </div>
      </div>
    </section>     
  <section class="section3">
      <div class="banner_img">
        <img src="https://i0.wp.com/madisonpac.com/wp-content/uploads/2020/03/Page-Title-Banner-Assets-Management.jpg?ssl=1"/>
        <div class="content">
          <h1>This is a testing image</h1>
        </div>
      </div>
    </section>
      <section class="section4">
      <div class="banner_img">
        <img src="https://www.wickedlywelsh.co.uk/cdn/shop/collections/WW-Easter-banner5.jpg?v=1625184016"/>
     
    <div class="content2">
          <h1>This is a testing image</h1>
        </div>
      </div>
    </section>   
</div>

*,
html {
    margin: 0;
    padding: 0;
    font-family: "Montserrat";
    box-sizing: border-box;

}

.sections
{
  height:100vh;
}
.section1,
.section2 ,.section3,.section4 {
    perspective: 1;
    transform-style: preserve-3d;
    overflow-y: scroll;
  position:relative;


}

.content{
   position: absolute;
  top: 80%;
  right: 10px;
  text-align: center;
  color: #00000; 
  z-index: 1;
  font-size:25px;
}

.content2{
   position: absolute;
  top: 3%;
  left: 15px;
  text-align: center;
  color: #fff; 
  z-index: 1;
  font-size:25px;
  padding:8%;
}

.banner_img {
    width: 100%;
    position: relative;
    overflow: hidden;
    z-index: -1;
  margin:0;

}

img {
    width: 100%;
}
2

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