How to add floating button on grid image in html & css

Issue

As shown in the image I have 4 divisions and need to add view-more floating button on image-4 (center of div). how can I do it using HTML & CSS

Note: I need a solution like this:

Code:

<div class="container">
   <div>
    <img> 1 </img>
  </div>

  <div>
    <img> 2 </img>
  </div>

  <div>
    <img> 3 </img>
  </div>

  <div>
    <img> 4 </img>
  </div>

</div>

Solution

/* CSS */

.container {
  width: 500px;
  display: grid;
  grid-template-columns: auto auto;
  grid-gap: 20px;
}

img {
  width: 100%;
}

.demo {
  position: relative;
}

.demo button {
  cursor: pointer;
  background-color: rgb(0, 0, 0, 0.5);
  color: white;
  font-weight: bold;
  padding: 5px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

<!--HTML-->

<div class="container">
  <div>
    <img src="https://s4.uupload.ir/files/1-6-5_ssnb.jpg" />
  </div>

  <div>
    <img src="https://s4.uupload.ir/files/1-6-5_ssnb.jpg" />
  </div>

  <div>
    <img src="https://s4.uupload.ir/files/1-6-5_ssnb.jpg" />
  </div>

  <div class="demo">
    <img src="https://s4.uupload.ir/files/1-6-5_ssnb.jpg" />
    <button>View-more</button>
  </div>

</div>

Answered By - Arman Ebrahimi