body, html {
    height: 100%;
    color: white;
  }
  .bg {
    /* The image used */
    background-image: url("/static/img/backgroud.jpg");
  
    /* Half height */
    height: 100%;
  
    /* Center and scale the image nicely */
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
  }

  .Absolute-Center {
    margin: auto;
    position: absolute;
    top: 0; left: 0; bottom: 0; right: 0;
}

.Absolute-Center.is-Responsive {
    width: 50%; 
    height: 50%;
    min-width: 200px;
    max-width: 400px;
    padding: 40px;
}