.container {
  margin-right: auto;
  margin-left: auto;
}
.container:before,
.container:after {
  content: " ";
  /* 1 */

  display: table;
  /* 2 */

}
.container:after {
  clear: both;
}
.row {
  margin-left: -10px;
  margin-right: -10px;
}
.row:before,
.row:after {
  content: " ";
  /* 1 */

  display: table;
  /* 2 */

}
.row:after {
  clear: both;
}
[class^="span"] {
  min-height: 1px;
  padding-left: 10px;
  padding-right: 10px;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
@media screen and (min-width: 768px) {
  .container {
    max-width: 728px;
  }
  [class^="span"] {
    float: left;
  }
  (.span12) {
    width: NaN%;
  }
  (.offset12) {
    margin-left: NaN%;
  }
}
@media screen and (min-width: 992px) {
  .container {
    max-width: 940px;
  }
}
@media screen and (min-width: 1200px) {
  .container {
    max-width: 1170px;
  }
  [class^="span"] {
    padding-left: 15px;
    padding-right: 15px;
  }
}
[class*="span"].pull-right {
  float: right;
}