The wiki you copied the template from has some custom CSS that is influencing how the infobox looks. It looks like you started copying their CSS but only Common.css. If you want to copy the rest of it, you also need to copy Wikia.css, Common.css/Anime-Common.css, and Themes.css.
It looks like some of their CSS is redundant or not used. You may want to consider removing those parts after you have copied them.