@charset "utf-8";
/* CSS Document */
.bgmenu {
  /* The image used */
  background-image: url("http://www.mmm.ru.ac.th/column-aj/e-bookaj/img/bg_mbook-1140.png");

  /* Full height */
  height: 100%; 

  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}