body {
  background-attachment: fixed;
  background-color: #000;
  background-position: top center;
  background-repeat: no-repeat;
  -webkit-background-size: cover;
     -moz-background-size: cover;
       -o-background-size: cover;
          background-size: cover;
}
@media only screen and (min-width:1920px) {
  body {
    background-image: url('../image/brooklyn_bridge.jpg');
  }
}
@media only screen and (min-width:1500px) and (max-width:1920px) {
  body {
    background-image: url('../image/brooklyn_bridge_1920.jpg');
  }
}
@media only screen and (min-width:1080px) and (max-width:1500px) {
  body {
    background-image: url('../image/brooklyn_bridge_1500.jpg');
  }
}
@media only screen and (min-width:720px) and (max-width:1080px) {
  body {
    background-image: url('../image/brooklyn_bridge_1080.jpg');
  }
}
@media only screen and (max-width:720px) {
  body {
    background-image: url('../image/brooklyn_bridge_720.jpg');
  }
}
#wrapper .middle {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
#header > .middle,
#footer > .middle {
  background: rgba(0,0,0,0.5);
  padding: 0;
}
#main > .middle,
#bottom > .middle {
  background: rgba(0,0,0,0.75);
  padding: 2%;
}
#main #progressbar .progressbar .progress {
  background: rgba(255,255,255,0.75);
}
#main #progressbar .progressbar .progress span.percent {
  color: #333;
  font-weight: bold;
  text-shadow: 0 1px 0 rgba(255,255,255,0.5);
}
#footer > .middle {
  padding: 10px;
}
#language_switch {
  left: 0;
}
#language_switch ul li a {
  background: #000;
  background: rgba(0,0,0,0.5);
  -webkit-border-radius: 0;
     -moz-border-radius: 0;
          border-radius: 0;
  padding-left: 20px;
}
@media only screen and (max-width:1080px) {
  #main > .middle,
  #bottom > .middle {
    padding: 5%;
  }
  #header > .middle,
  #footer > .middle {
    background: transparent;
  }
  #bottom .block {
    border-bottom: 1px solid #fff;
    border-bottom: 1px solid rgba(255,255,255,0.2);
    padding-bottom: 80px;
  }
  #bottom .block:last-child {
    border-bottom: 0 none;
  }
  #bottom .block .button {
    bottom: 35px;
  }
}