.app-view {
            height: 100vh;
            width: 100%;
            margin: 0 ;
            display: block;
            border-style: none;
    }
    @media only screen and (min-width: 600px) {
        .app-view {
            height: 844px;
            width: 390px;
            margin: 0 auto;
            display: block;
            border-style: none;
        }
    }