body {
  position: relative;
  color: #555;
  font-size: 16px;
  font-family: arial,sans-serif;
  background: url('../img/bg.jpg') no-repeat center fixed; 
      -webkit-background-size: cover;
      -moz-background-size: cover;
      -o-background-size: cover;
      background-size: cover;
      overflow-y: hidden;
      overflow-x: hidden;
}
#txt {
position: absolute;
margin: 20px 15px 15px 15px;
}