JSFiddle - React, Tailwind, and code Playground

HTML

<textarea class="customResize"></textarea>

CSS

.customResize {
    width: 300px; 
    height: 100px;
}

.customResize::-webkit-resizer{ 
    border : 9px solid rgba(0,0,0,.1);
    border-bottom-color: rgba(0,0,0,.5);
    border-right-color: rgba(0,0,0,.5);
    outline: 1px solid rgba(0,0,0,.3);
    box-shadow: 0 0 5px 3px rgba(0,0,0,.1);
}