Need to modify a field added to or checkout page

[Hal_Richman]

Shopify support added a field to our checkout page using the following code for a Referral Code.

<p class="cart-attribute__field">
<label for="referral-code">Referral Code</label>
<textarea id="referral-code" name="attributes[Referral Code]"></textarea>
</p>

The code was pasted in the cart-template.liquid file right before the </form> tag. This works fine - we can get the code from the API for a report.

Our need is cosmetic - we need to make the field larger and bolded. Need to hire someone to do this.