Slowly zooming background image

I've been searching all over the place but can't seem to find a clear answer on how to slowly zoom in the background image using CSS. Any help would be greatly appreciated. Currently, my code only zooms the text elements and not the background.

CSS:

body {
    background-image: url("../img/background.jpg");
    background-repeat:no-repeat;
    background-attachment:fixed;
    background-size:cover;
    background-position:center-top;
    background-position-x: 50%;
    background-position-y: 0%;
    -webkit-animation: zoomin 5s 1;
}

@-webkit-keyframes zoomin {
    0% {
        -webkit-transform: scale(1);
    }
    100% {
        -webkit-transform: scale(2);
    }

}
csszoomingtransform

Answer №1

There was difficulty in getting the body to scale properly, possibly due to the user stylesheet overriding it. One solution is to utilize an inner div:

<style>
div {
    background-image: url("http://upload.wikimedia.org/wikipedia/commons/4/4e/Pleiades_large.jpg");
    background-repeat:no-repeat;
    background-attachment:fixed;
    background-size:cover;
    background-position:center-top;
    background-position-x: 50%;
    background-position-y: 0%;
    -webkit-animation: zoomin 5s 1;
}

@-webkit-keyframes zoomin {
    0% {
        -webkit-transform: scale(1);
    }
    100% {
        -webkit-transform: scale(2);
    }

}
</style>
<body>
<div style="position:absolute;top:0;bottom:0;left:0;right:0;"></div>
</body>

Answer №2

Check out this easy-to-follow demonstration:

Demo Link

The technique involves using transform: scale; and triggering the change by applying a jQuery class on an event (I opted to trigger it upon DOM load).

Here is the HTML:

<main id="kb">
    <img src="https://iso.500px.com/wp-content/uploads/2014/08/2048-5.jpg" alt="baby elephants" />
</main>

Here is the CSS:

html,
body {
    width:100%;
    height:100%;
}

#kb {
    width:100%;
    height:100%;
    position:relative;
}

#kb img {
    transform-origin: 20% 80%;
    transition: transform 70s linear;
    position:absolute;
    top:50%;
    left:50%;
    margin-left:-1024px;
    margin-top:-703px;
}
#kb img.zoom {
    transform: scale(2);
}

Finally, the JavaScript part:

$(document).ready(function(){
    $('#kb > img').addClass('zoom');
});

If you wish to adjust the speed of the animation, simply modify the "transition" value in the CSS.

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