html, body {
  width: 100%;
  height: 100%;
}

body {
  background-image:
    linear-gradient(rgba(255,255,255,.88), rgba(255,255,255,.88)),
    url("../assets/bg.jpg");

  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}