#app{font-family:Avenir,Helvetica,Arial,sans-serif;text-align:center;color:#2c3e50;margin-top:60px}.login{display:flex;flex-direction:column;align-items:center}.error{color:red}.main-screen{display:flex;flex-direction:column;align-items:center}.result{margin-top:20px}.logout{margin-top:20px;background-color:#f44336;color:#fff;border:none;padding:10px 20px;cursor:pointer}.already-read-message{margin-top:10px;background-color:#ffeb3b;padding:10px;color:#000;border:1px solid #fbc02d}