how to make a button active by default
<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;
}