h1:hover.follow{
    animation: heartbeat 2s infinite;
}

img.follow{
    height: 100px;
    pointer-events: none;
    position: absolute;
    top: 0;
    left: 0;
    transform: translate(-50%, -50%);
    z-index: 1000;
    opacity: 1;
}

#penguins {
    display: inline-block; 
    background-color: #eee; 
    padding: 1em;
}

#penguins:hover {
    background-color: #ccc;
}