html { 
  background: url(../img/bg.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
body.trans {background-color: rgb(255, 255, 255, 0.85);}
.container {margin-top: 2em; padding:  2%; text-align: center;}

ul {list-style: none;}