Include hardcoded fiels

I hard coded this set of checkboxes in CF7 but I cannot get the data from them when I submit the form. In the Mail tab, Message Body, I’ve tried adding [checkbox-type] and all of the individual IDs of the options.

<fieldset>
  <legend><b>What type of project is needed?</b></legend>
    <input type="checkbox" name="checkbox-type" value="Website" id="Website"><label for="Website">Website design</label>
    <input type="checkbox" name="checkbox-type" value="Branding or marketing collateral" id="Branding or marketing collateral"><label for="Branding or marketing collateral">Branding or marketing collateral</label>
</fieldset>