.container {
    width: 100vw;
    height: 100vh;
    /*background: #6C7A89;*/
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    background-image: url(../img/background.jpg);    
    background-size: 100% 100%;
    }
    .box {
    width: 500px;
    height: 300px;
    background: #fff;
    }
    body {
    margin: 0px;
    }