mdb-ui-kit/less/_form.less

.mdb-label-color-toggle-focus() {
  // override bootstrap focus and keep all the standard color (could be multiple radios in the form group)
  .form-group.is-focused & {
    color: @mdb-label-color;

    // on focus just darken the specific labels, do not turn them to the brand-primary
    &:hover,
    &:focus {
      color: @mdb-label-color-toggle-focus;
    }

    // correct the above focus color for disabled items
    fieldset[disabled] & {
      color: @mdb-label-color;
    }
  }
}

.form-horizontal {

  // Consistent vertical alignment of radios and checkboxes
  .radio,
  .checkbox,
  .radio-inline,
  .checkbox-inline {
    padding-top: 0;
  }

  .radio {
    margin-bottom: 10px;
  }

  label {
    text-align: right;
  }

  label.control-label {
    margin: 0;
  }
}