Using Dynamic Attributes - Showing Elements Based On Condition

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Firstly you have done a great job- I had a sort of scales falling from eyes revelation— but this won’t work for me

   <div class="row mt-4 text-secondary bg-light justify-content-center no-gutters font-weight-lighter text-capitalize text-left lead rounded rounded-sm border-secondary" id="personalDetails" dmx-show="bs4checkbox.checked">
            <div class="col">
              <h1>Fancy display heading</h1>
              <input id="address" name="address" type="text" class="form-control" placeholder="City">
              <input id="Country" name="Country" type="text" class="form-control" placeholder="Country">
            </div>
          </div>
          <div class="row justify-content-start mt-4"></div>
          <button class="btn mt-4">Submit</button></div>
      </div>
    </form>