Moving an image up in CSS

So, for the past hour I've being trying to move this image using the css property position. My problem is every time I move it using top or bottom it doesn't work correctly. Here's a screenshot of it before using said properties and after. Below you can find my html & css. Lastly, this position has to be absolute or the image completely disappears.

HTML

<section class="row posts">
    <div class="col-md-6 col-md-offset-3">
        <header><h3>What others have to say...</h3></header>
        @foreach($posts as $post)
            <article class="post" data-postid="">
                <p></p>
                <div class="info">
                    Posted by  on 
                </div>
                <div class="interaction">
                    <a href="#" class="like heart"></a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|
                    <a href="#" class="like">Dislike</a>
                    @if(Auth::user() == $post->user)
                        |
                        <a href="#" class="edit">Edit</a> |
                        <a href="">Delete</a>
                    @endif
                </div>
            </article>
        @endforeach
    </div>
</section>

CSS

.heart{
    background: url('http://localhost:8079/uncaughterror/public/src/img/web_heart_animation.png');
    background-position: left;
    background-repeat: no-repeat;
    height: 50px; width: 50px;
    cursor: pointer;
    position: absolute;
    left: 12px;
    bottom: 5px; //This or 'top' is what causes my entire problem
    background-size:1450px;
}

.heart:hover {
    background-position: right;
}

via Chebli Mohamed