Code box Inner Button

1st code paste (b:skin) just up.

HTML

<!--[https://alamin557.blogspot.com/]-->

.mollaarea {
position: relative;
display: inline-block;

border: 1px solid #ccc;
background-color: white;
border-radius: 10px;
padding: 20px;
}
.mollaarea textarea {
box-sizing: border-box;
background-color: white;
height: 200px;
resize: none;
border: none;
outline: none;
padding: 10px;
font-size: 16px;
}
.mollaarea button {
position: absolute;
padding: 5px 10px;
font-size: 15px;
color: #5784f5;
right: 10px;
top:10px;
border: 1px solid #5784f5;
border-radius: 10px;
cursor: pointer;
background-color: #fff;
}
.mollaarea button:active {
background-color: #1453f1;
color: #fff;
}

2nd code paste < / body> just up.

HTML 2

<script>  
    function copyhtml() {
const Text = document.querySelector("#htmlText");
const btnText = document.querySelector("#htmlBtn");

Text.select();
document.execCommand("copy");
btnText.textContent = "Copied";
setTimeout(function(){
btnText.textContent = "Copy";
}, 5000);
    }
  
  </script>

3rd code paste go to post paste after(code paste)

HTML 3

<div><div class="mollaarea">
  <textarea id="htmlText">  
<!-- paste here -->
</textarea>
    
<button onclick="copyhtml()">
 <span id="htmlBtn">Copy
   </span>
   </button>
  </div></div>