body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.42857143;
  color: #333;
  background-color: #fff;
  margin: 0;
}
* { box-sizing: border-box; }
.box { left: 50%; top: 30%; width: 300px; margin-left: -150px; height: 200px; bottom: 10px; padding: 10px; word-break: break-all; position: fixed; }
.logo { text-align: center; margin-bottom: 20px; }
.tip { text-align: center; margin-bottom: 15px; letter-spacing: 1px; }
.progress { height: 20px; margin-bottom: 20px; overflow: hidden; background-color: #f5f5f5; border-radius: 4px; box-shadow: inset 0 1px 2px rgba(0, 0, 0, .1); height: 8px; }
.progress-bar { float: left; width: 0%; height: 100%; font-size: 12px; line-height: 20px; color: #fff; text-align: center; background-color: #337ab7; box-shadow: inset 0 -1px 0 rgba(0, 0, 0, .15); transition: width .6s ease; }
.progress-bar-success { background-color: #5cb85c; }
/* 覆盖：加载完 CSS 后恢复浅色 */
body { background-color: #fff !important; color: #333 !important; }
.progress-bar-success { background-color: #5cb85c !important; }