.input-group {
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  max-width: 23rem;
}

.input-group[class*="col-"] {
  float: none;
  padding-left: 0;
  padding-right: 0;
}

.input-group .form-control {
  position: relative;
  z-index: 2;
  float: left;
  width: 100%;
  margin-bottom: 0;
}

.input-group .form-control:focus {
  z-index: 3;
}

.input-group .form-control:focus ~ .input-group-addon {
  outline: 0;
}

.input-group-addon:not(:first-child):not(:last-child),
.input-group-btn:not(:first-child):not(:last-child),
.input-group .form-control:not(:first-child):not(:last-child) {
  border-radius: 0;
}

.input-group-addon,
.input-group-btn {
  white-space: nowrap;
  vertical-align: middle;
}

.input-group-addon {
  -webkit-transition: border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
  transition: border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
  transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
  transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
  padding: 6px 12px;
  font-size: 16px;
  font-weight: normal;
  line-height: 1;
  text-align: center;
}

.input-group.input-group-expanded .input-group-addon {
  padding: .75rem .5rem .75rem 1.25rem;
  font-size: .875rem;
  line-height: 21px;
}

.input-group.input-group-expanded .input-group-addon + .form-control {
  max-width: 240px;
  height: 48px;
}

.input-group-addon:first-child {
  border-right-width: 0;
}

[dir='rtl'] .input-group-addon:first-child {
  border-right-width: 1px;
  border-left-width: 0;
}

.input-group-addon:last-child {
  border-left-width: 0;
}

[dir='rtl'] .input-group-addon:last-child {
  border-left-width: 1px;
  border-right-width: 0;
}

.input-group .form-control:first-child,
.input-group-addon:first-child {
  border-bottom-right-radius: 0;
  border-top-right-radius: 0;
}

.input-group .form-control:last-child,
.input-group-addon:last-child {
  border-bottom-left-radius: 0;
  border-top-left-radius: 0;
}

.input-group-expanded {
  max-width: none;
}

.form-disabled .input-group.input-group-expanded,
.form-disabled .input-group.input-group-expanded + .help-block {
  opacity: .5;
}