body{font-family:sans-serif;padding:20px;background-color:#f0f0f0}#app-container{background-color:#fff;padding:20px;border:1px solid #ccc}.error{color:red;font-weight:700}.success{color:green;font-weight:700}pre{background-color:#eee;padding:10px;border-radius:4px;white-space:pre-wrap;word-wrap:break-word}