html, body {height: 100%}

body {
    position: relative;
    padding: 0;
    margin:0;
    font-family: sans-serif;
}
.image {
    position: relative;
    left: 0px;      
    height: 100%;
    background-position: 50% 50%;
    background-size: cover;
    background-attachment: scroll;
    text-align: center;
}
img {
  width: 70%;
  height: 70%;
  margin: auto;
  position: absolute;
  top: 0; left: 0; bottom: 0; right: 0;
}

.text {
    margin-top: -50px;
    text-align: center;     
}