/* Fixed, non-scrolling cosmic backdrop */
html, body {
  height: 100%;
  margin: 0;
  background: #000; /* fallback while image loads */
  background-image: url('assets/bg.png'); /* replace with your file or a hosted URL */
  background-size: cover;           /* scale to fill */
  background-position: center;      /* center subject */
  background-repeat: no-repeat;
  background-attachment: fixed;     /* <- this is the key */
}

/* smooth fonts */
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}