Template:Logo/styles.css

.prism-logo a img.thumbimage:hover, .prism-logo a img:hover {
    transform: scale(1.1);
    transition: transform 250ms cubic-bezier(0.215,0.61,0.355,1);
}
.prism-logo a img.thumbimage, .prism-logo a img {
    transition: transform 250ms cubic-bezier(0.215,0.61,0.355,1);
}