<div id="myDIV"> <button class="btn">1</button> <button class="btn active">2</button> <button class="btn">3</button> <button class="btn">4</button> <button class="btn">5</button> </div> style:- .btn { border: none; outline: none; padding: 10px 16px; background-color: #f1f1f1; cursor: pointer; } /* Style the active class (and buttons on mouse-over) */ .active, .btn:hover { background-color: #666; color: white; }

how to make a button active by default