Coverart tenia una prop con class en vez de className

src/components/CoverArt.jsx

@@ -11,7 +11,7 @@ export const CoverArt = (props) => {
             return (
                 <Fragment>
                     <img src={props.cover_art.image} className={'coverart loading'} alt={props.alt} onLoad={handleLoad}/>
-                    <div class={'coverart pulsating'}/>
+                    <div className={'coverart pulsating'}/>
                 </Fragment>
             )
         } else {