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

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

header img {
  margin-top: 3px;  
  width: 100%
}