After implementing the markup code, I achieved the desired layout on large screens. However, when reducing the screen size to a phone level, I require a layout similar to image-3, and on larger screens like laptops, it should resemble image-1. Image-1 and Image-3 are references to a single linked image.
I am utilizing Bootstrap-4 and HTML-5 for this task.
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" />
<div class="container-fluid">
<h6>Image-1 in large screens like laptop</h6>
<div class="row">
<div class="col-sm-8 ">
<div class=" card">
<button class="bg-danger" style="padding: 15%; font-size: 15px">bigone</button>
</div>
</div>
<div class="col-sm-4">
<div class="card"><button class="bg-danger" style="padding: 10%; font-size: 15px">oneSmall</button></div>
<div class="card"><button class="bg-danger" style="padding: 10%; font-size: 15px">oneSmall</button></div>
</div>
</div>
</div>
https://i.sstatic.net/a0yUK.jpg
This image illustrates the desired layout.