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HTML

              
                <!--

Forum question answer only:

https://www.sitepoint.com/community/t/observe-last-child-by-using-intersection-observer/402042/9

-->
<header>
  <h1>Start scrolling</h1>
</header>

<div class="main">
  <!-- <div class="BG"></div> -->
  <div class="section s1" data-src="https://i.postimg.cc/9QYL3ytR/mobile-camp.png">
    <div class="text">
      <div style="margin-inline: 20px">
        <h1>Our Story</h1>
        <div class="story-detail">
          <p>
            We saw a gap between what people need and what banks offer. It
            means millions of us aren't getting the banking experience we
            deserve for different reasons.
          </p>
        </div>
      </div>
    </div>
  </div>

  <div class="section s2" data-src="https://i.postimg.cc/9QYL3ytR/mobile-camp.png">
    <div class="text">
      <div style="margin-inline: 20px">
        <div class="story-description">
          <p>
            Traditional banks don’t focus on customers' experience, their
            systems may be slow and outdated, they may prioritize a specific
            group of people, or perhaps they lack the ability to innovate,
            and so on.
          </p>
        </div>
      </div>
    </div>
  </div>

  <div class="section s3" data-src="https://i.postimg.cc/cLPLS8xW/mobile-desert.png">
    <div class="text">
      <div style="margin-inline: 20px">
        <div class="story-description">
          <p>
            So since we're passionate about solving problems and bridging
            gaps, we looked into and identified the challenges and
            capabilities we'll need to build a bank here in the Kingdom.
          </p>
        </div>
      </div>
    </div>
  </div>

  <div class="section s4" data-src="https://i.postimg.cc/mZnqV38T/mobile-birds.png">
    <div class="text">
      <div style="margin-inline: 20px">
        <div class="story-description">
          <p>
            With the best local and international expertise, we began
            building an innovative digital bank designed by and for the
            people. We believe that the most effective way to build a bank
            for people is to do it with them. This is our philosophy. So, we
            started building it with the help of people like you.
          </p>
        </div>
      </div>
    </div>
  </div>
  <div class="section s5" data-src="https://i.postimg.cc/k513m0Fb/mountain.png">
    <div class="text">
      <div style="margin-inline: 20px">
        <div class="story-description">
          <p>
            At D360, innovation starts with someone’s passion for improving
            financial services. To that person, we say: Never stop offering
            solutions to your needs. These solutions will not only benefit
            you, but will significantly impact the lives of millions.
          </p>
        </div>
      </div>
    </div>
  </div>
</div>
              
            
!

CSS

              
                /*

Forum question answer only:

https://www.sitepoint.com/community/t/observe-last-child-by-using-intersection-observer/402042/9

*/
html,
body {
  margin: 0;
  padding: 0;
}
h1 {
  text-align: center;
  margin: 0;
  padding: 1rem 0;
}
header {
  background: #ccc;
}
header,
footer,
.main {
  min-height: 100vh;
}

.section {
  min-height: 100vh; /* can't be 105vh as that is bigger than parent*/
  display: flex;
  z-index: 1;
  position: relative;
  background-size: cover;
}

.text {
  margin: auto;
}

.text p {
  font-family: "Lato";
  font-style: normal;
  font-weight: 500;
  font-size: 18px;
  line-height: 149%;
  color: #263244;
}

.text h1 {
  margin-bottom: 20px;
  font-family: "Lato";
  font-style: normal;
  font-weight: 700;
  font-size: 50px;
  line-height: 0px;
  color: #ffffff;
  margin-bottom: 50px;
}

.text .story-detail {
  width: 321px;
  border-radius: 20px;
  background: radial-gradient(
    76.31% 191.89% at 13.43% 22.19%,
    rgba(226, 228, 231, 0.8) 0%,
    rgba(228, 228, 229, 0.368) 100%
  );
  backdrop-filter: blur(10px);
  padding: 23px;
}

.text .story-description {
  width: 321px;
  border-radius: 20px;
  background: radial-gradient(
    76.31% 191.89% at 13.43% 22.19%,
    rgba(226, 228, 231, 0.8) 0%,
    rgba(228, 228, 229, 0.368) 100%
  );
  backdrop-filter: blur(10px);
  padding: 23px;
}
/*
.BG {
  position: fixed;
  height: 100%;
  width: 100%;
  z-index: 0;
  opacity: 1;
  top: 0px;
  transition: opacity 10s ease-in-out;
  background-size: cover;
  background-repeat: no-repeat;
}
*/

.s1 {
  background: url(https://i.postimg.cc/9QYL3ytR/mobile-camp.png) fixed;
}
.s2 {
  background: url(https://i.postimg.cc/9QYL3ytR/mobile-camp.png) fixed;
}
.s3 {
  background: url(https://i.postimg.cc/cLPLS8xW/mobile-desert.png) fixed;
}
.s4 {
  background: url(https://i.postimg.cc/mZnqV38T/mobile-birds.png) fixed;
}
.s5 {
  background: url(https://i.postimg.cc/k513m0Fb/mountain.png) fixed;
}
.section {
  background-size: cover; /* change to contain for smaller picture*/
  background-position: center;
  background-repeat: no-repeat;
}

              
            
!

JS

              
                /*

Forum question answer only:

https://www.sitepoint.com/community/t/observe-last-child-by-using-intersection-observer/402042/9

*/

              
            
!
999px

Console