body {
  font-family: aharoni;
  color: white;
  background: url("../images/b.jpg");
}

body, html {
  height: 100%;
}

.bg {
  /* The image used */
  background-image: url("images/b.jpg");

  /* Full height */
  height: 100%;

  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
<style>
body {font-family: "Lato", sans-serif}
.mySlides {display: none}
</style>