JSFiddle - React, Tailwind, and code Playground

HTML

<div class='wrapper'>
    <textarea class='textarea'></textarea>  
    <img src='https://cdn3.iconfinder.com/data/icons/unicons-vector-icons-pack/32/settings-128.png' class='img'>
</div>

CSS

.wrapper{
    width:300px;
    height:auto;
    border:1px solid red;
    position:relative;  

}

.textarea{
    position:relative;
    width:280px;
    height:100px;
    border:0px solid;
    resize:none

}

.img{
    float:right;
    position:absolute;
    width:20px;
    height:20px;

}