teehee

HTML:
<div class="ghost"></div>

CSS (goes under the style tag):
.ghost {
    position: fixed;
    background-size: 100%;
    height: 430px;
    width: 320px;
    bottom: 0;
    left: 0;
    background: url(https://media.tenor.com/nio_KdFWH8IAAAAi/ghost-ghost-cod.gif);
}