body {
    width: 80%;
    margin:auto;
    font-family: sans-serif;
  }
  #header {
    text-align: left;
    background: rgb(220,220,220); /* IE fallback */
    background: rgba(200,200,200, .3);  
  }
  #footer {
    text-align: right;
    background: rgb(220,220,220); /* IE fallback */
    background: rgba(200,200,200, .3);