Justify-content: center is broken

[rodolphonetto]

Hi , I'm using your project to build a simple desktop app but I found out that justify-content: center does not work. I've done that only that style and I receive in console this message Invalid value: justifyContent: "23" Thanks for you time 😄

        #container {
            width: 905px;
            height: 600px;
            color: red;
            padding: 10px;
            background-image: url('./assets/background.jpg');
            flex-direction: row;
            justify-content: center;
        }
        #button {
          color: white;
          font-size: 20px;
          border: 1px solid white;
          padding: 20px 35px;
        }