.btn-group.pr {
  position: relative;
  margin-left: 3px;
}
.btn-group .dropdown-menu {
  position: absolute;
  top: 35px;
}
.btn-group .dropdown-menu li {
  line-height: 30px;
  height: 30px;
  padding: 0px 15px;
  background-color: #fff;
  border-bottom: 1px solid #ececec;
}
.btn-group .dropdown-menu li:last-child {
  border-bottom: 0px solid #ececec;
}
.btn-group .dropdown-menu li:hover {
  background-color: #e6f1ff;
}
.btn-group .dropdown-menu li input{
  margin-right: 5px;
}
.btn-group .dropdown-menu.lt {
  left: 0px;
  right: auto;
}
.btn-group .dropdown-menu.rt {
  right: 0px;
  left:auto;
}
.btn-group .dropdown-menu.ct {
  left: 50%;
  transform: translate(-50%, 0);
}