contents.css in CKEditor Widgets Bootstrap Grid 1.0.x

/* Bootstrap styles */
.row {
  margin-left: -15px;
  margin-right: -15px;
}
.row:before,
.row:after {
  content: " ";
  display: table;
}
.row:after {
  clear: both;
}

.col-xs-1,
.col-sm-1,
.col-md-1,
.col-lg-1,
.col-xs-2,
.col-sm-2,
.col-md-2,
.col-lg-2,
.col-xs-3,
.col-sm-3,
.col-md-3,
.col-lg-3,
.col-xs-4,
.col-sm-4,
.col-md-4,
.col-lg-4,
.col-xs-5,
.col-sm-5,
.col-md-5,
.col-lg-5,
.col-xs-6,
.col-sm-6,
.col-md-6,
.col-lg-6,
.col-xs-7,
.col-sm-7,
.col-md-7,
.col-lg-7,
.col-xs-8,
.col-sm-8,
.col-md-8,
.col-lg-8,
.col-xs-9,
.col-sm-9,
.col-md-9,
.col-lg-9,
.col-xs-10,
.col-sm-10,
.col-md-10,
.col-lg-10,
.col-xs-11,
.col-sm-11,
.col-md-11,
.col-lg-11,
.col-xs-12,
.col-sm-12,
.col-md-12,
.col-lg-12 {
  position: relative;
  min-height: 1px;
  float: left;
  padding: 15px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
}
.col-md-6 {
  width: 50%;
}
.col-md-3 {
  width: 25%;
}
.col-md-9 {
  width: 75%;
}
.col-md-4 {
  width: 33.3%;
}

/* Custom styles */
.col-md-6 img,
.col-md-3 img,
.col-md-4 img,
.col-md-9 img {
  display: block;
  max-width: 100%;
  height: auto;
}
.two-col,
.two-col-left,
.two-col-right,
.three-col {
  padding: 8px;
  margin: 10px auto;
  background: #eee;
  border-radius: 8px;
  border: 1px solid #ddd;
  box-shadow: 0 1px 1px #fff inset, 0 -1px 0px #ccc inset;
}
.two-col .col-md-6,
.two-col-left .col-md-3,
.two-col-left .col-md-9,
.two-col-right .col-md-3,
.two-col-right .col-md-9,
.three-col .col-md-4 {
  box-shadow: 0 1px 1px #ddd inset;
  border: 1px solid #cccccc;
  border-radius: 5px;
  background: #fff;
  min-height: 5em;
}
.two-col .col-md-6,
.two-col-left .col-md-3,
.two-col-left .col-md-9,
.two-col-right .col-md-3,
.two-col-right .col-md-9 {
  margin: -3px;
}
.two-col-right .col-sidebar,
.two-col-left .col-sidebar {
  padding: 0;
}
.two-col {
  margin-left: 9px;
}
.three-col .col-first {
  margin-left: -3px;
}
.three-col .col-second {
  margin-left: 3px;
}
.three-col .col-third {
  margin-left: 3px;
  margin-right: -3px;
}
.two-col-left .col-md-9 {
  margin-left: 8px;
}
.two-col-right .col-md-9 {
  margin-right: 8px;
}