button.clean-gray {
  background-color: #eeeeee;
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #eeeeee), color-stop(100%, #cccccc));
  background-image: -webkit-linear-gradient(top, #eeeeee, #cccccc);
  background-image: -moz-linear-gradient(top, #eeeeee, #cccccc);
  background-image: -ms-linear-gradient(top, #eeeeee, #cccccc);
  background-image: -o-linear-gradient(top, #eeeeee, #cccccc);
  background-image: linear-gradient(top, #eeeeee, #cccccc);
  border: 1px solid #ccc;
  border-bottom: 1px solid #bbb;
  border-radius: 3px;
  color: #333;
  font: bold 11px/1 "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Geneva, Verdana, sans-serif;
  padding: 8px 0;
  text-align: center;
  text-shadow: 0 1px 0 #eee;
  width: 300px; }
  button.clean-gray:hover {
    background-color: #dddddd;
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #dddddd), color-stop(100%, #bbbbbb));
    background-image: -webkit-linear-gradient(top, #dddddd, #bbbbbb);
    background-image: -moz-linear-gradient(top, #dddddd, #bbbbbb);
    background-image: -ms-linear-gradient(top, #dddddd, #bbbbbb);
    background-image: -o-linear-gradient(top, #dddddd, #bbbbbb);
    background-image: linear-gradient(top, #dddddd, #bbbbbb);
    border: 1px solid #bbb;
    border-bottom: 1px solid #999;
    cursor: pointer;
    text-shadow: 0 1px 0 #ddd; }
  button.clean-gray:active {
    border: 1px solid #aaa;
    border-bottom: 1px solid #888;
    -webkit-box-shadow: inset 0 0 5px 2px #aaaaaa, 0 1px 0 0 #eeeeee;
    box-shadow: inset 0 0 5px 2px #aaaaaa, 0 1px 0 0 #eeeeee; }

body { text-align: center; background: #FFF url(../images/bg_app.jpg) center top no-repeat; }
.container { width: 900px; position: relative; margin: 300px auto 0; }
#download_app { margin: 0px auto 100px; font-size: 20px }
#download_app em { color: #666; font-size: 12px; }
form { display: block; padding: 20px 40px; width: 400px; margin: 0 auto 0; border: 1px solid #666; border-radius: 10px; background: rgba(255, 255, 255, 0.8) }

.cert { display: block; position: absolute; top: -290px; right: 0; outline: none; }
.cert img { display: block; width: 120px; height: 120px; }