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

  /* Full height */
  height: 100%;

  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}
.logo_text {
    color: aliceblue;
    text-align: center;
    font-size: 24px;
    text-shadow: 1px 1px 5px black;
    vertical-align: bottom;
}