body {
    background-image: url('../img/346_back.jpg');
    background-size: cover;
   /* background-position: center;*/
}
@media only screen and (max-width: 768px) {
  /* For mobile phones: */
  body {
    background-image: url('../img/346_back.jpg');
    background-size: auto 100%;
  }
}

#headerImage{
    width: 100%;
}