<div class="loading">
  <div class="progress">
    <div class="progress_bar">
      
    </div>
    <div id="prog_status">
      Loading...
    </div>
  </div>
</div>

body{
  margin: 0;
  padding: 0;
  background: #333843;
}

.loading{
  position: absolute;
  top: calc(50% - 12px);
  top: -webkit-calc(50% - 12px);
  left: calc(50% - 145px);
  left: -webkit-calc(50% - 145px);
}

#progress_message{
  display: block;
  background: rgba(40,43,52,0.9);
  box-shadow: 0 5px 10px #000;
  position: absolute;
  top: 0px;
  left: 347px;
  width: 300px;
  height: 60px;
  z-index: 201;
  font-family: Arial;
  font-weight: bold;
  color: #fff;
  font-size: 14px;
  text-shadow: 0 1px 0 #000;
  padding: 10px;
  padding-top: 15px;
  border-bottom-left-radius: 3px;
  border-bottom-right-radius: 3px;
}

.progress{
  width: 290px;
  height: 28px;
  border-radius: 2px;
  background: #20222A;
  padding: 3px;
  margin: 0;
  border: 1px solid #1A1C21;
  box-shadow: inset 0 0 3px #222, 0 1px 0 #484848;
}

.progress_bar{
  width: 0;
  height: 25px;
  border-radius: 3px;
  border: 1px solid #2A2B2F;
  background: rgb(54,168,233); /* Old browsers */
  background: -moz-linear-gradient(top, rgba(54,168,233,1) 0%, rgba(17,126,210,1) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(54,168,233,1)), color-stop(100%,rgba(17,126,210,1))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, rgba(54,168,233,1) 0%,rgba(17,126,210,1) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top, rgba(54,168,233,1) 0%,rgba(17,126,210,1) 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top, rgba(54,168,233,1) 0%,rgba(17,126,210,1) 100%); /* IE10+ */
  background: linear-gradient(to bottom, rgba(54,168,233,1) 0%,rgba(17,126,210,1) 100%); /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#36a8e9', endColorstr='#117ed2',GradientType=0 ); /* IE6-9 */
  box-shadow: inset 0 1px 0 #4dc8db, 0 1px 0 #393C45;
  padding: 0;
  margin: 0;
}

#prog_status{
  position: absolute;
  top: 10px;
  left: 0px;
  width: 100%;
  text-align: center;
  color: #fff;
  font-weight: bold;
  font-size: 12px;
  font-family: Arial;
  text-shadow: 0 -1px 0 #191A1E;
}

$(document).ready(function(){
  animate();
});

function animate(){
  $(".progress_bar").width("0px");
  $(".progress_bar").animate({
    width: '99%'
  }, 6000, function(){setTimeout('animate()',2500);});
}