SO background cover with transparent text

HTML

<h1 class="figcaption">
    Why CSS3 needs to be used today
</h1>

CSS

h1.figcaption { 
    color:white;
    position: absolute; 
    bottom: 0px; 
    left: 20px; 
    font-size: 90px; 
 
  filter: alpha(opacity=35);
    text-shadow: 2px 2px 2px #000;
}

body
{
 background: url(https://dl.dropboxusercontent.com/u/2665617/bootstrap/images/image1.jpg) no-repeat; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;   
    background-position: 50% 50%;
    height:100%;
}
html{
    height:100%;
}