Expand div from center of the body using jQuery

Question

How could I expand / grow a div from center? It currently expands from top left to bottom right. Here's a jsFiddle.

<div class="growme">test</div>

$('.growme').animate({
    width: '100%',
    height: '100%',
    opacity: 1,
}, 'normal');

.growme {
    background-color: #990000;
    height: 0;
    width: 0;
    position: absolute;
    filter: alpha(opacity=0);
    opacity: 0;
}

Answer 1

Try this make your .growme class center of the body. by adding top, left,bottom and right as 0.

$('.growme').animate({
    width: '100%',
    height: '100%',
    opacity: 1,
}, 'normal');

.growme {
    background-color: #990000;
    height: 0;
    width: 0;
    position: absolute;
    filter: alpha(opacity=0);
    opacity: 0;
    top:0;
    left:0;
    bottom:0;
    right:0;
    margin:auto;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="growme">test</div>

**

OR

**

You can also use transition for the same.

$('.growme').animate({
    width: '100%',
    height: '100%',
    opacity: 1,
}, 'normal');

.growme {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    margin: auto;
    background-color: #990000;
    position: absolute;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="growme">test</div>