body {
  background: url(imgs/background.jpg) no-repeat center center fixed !important;
  background-size: auto;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
}

header {  
  text-align: center;
  margin: 10px 0px 30px 0px;  
}