Can't adjust width of custom liquid section on a page

Hi,

I need to adjust the width of a single custom liquid section for my stockist store locator. It’s currently at full width but I need to add padding or a margin on each side.

I have a very basic understanding of code and i’ve tried multiple ‘generic’ code snippets and solutions that have worked for other people in the shopify community but I just can’t seem to fix it. Can anyone help me fix this?

Added some information that might be useful below. Not sure if this is relevant but i’m using a custom version of the ‘Debut’ theme that was built using Shopify Slate by someone else.

This is what it looks like now

This is what I want it to look like

URL is https://www.allo.nz/pages/store-locator

Password for store is cttmfcc

This is the code for the page template (Templates>page.store-locator.json)

{
  "sections": {
    "main": {
      "type": "divider",
      "settings": {
        "divider": 0,
        "mobile_divider": 0
      }
    },
    "1646836839fc4967a7": {
      "type": "rich-text",
      "settings": {
        "full_width": true,
        "section_title": "Find an Allo Vape Stockist near you!",
        "text": "<p>There is over 350 Allo Vapour stockists nation-wide and that number continues to grow. Need to find one close to you?<\/p><p>Simply enter your address, post code or nearby town\/city to view a list of retailers near you. <\/p>",
        "text_size": "medium"
      }
    },
    "16468368138fec8529": {
      "type": "custom-liquid",
      "settings": {
        "custom_liquid": "<!-- Start Stockist.co widget -->\n<div data-stockist-widget-tag=\"u15486\">Loading store locator\nfrom <a href=\"https:\/\/stockist.co\">Stockist store locator<\/a>...<\/div>\n<script>\n  (function(s,t,o,c,k){c=s.createElement(t);c.src=o;c.async=1;\n  k=s.getElementsByTagName(t)[0];k.parentNode.insertBefore(c,k);\n  })(document,'script','\/\/stockist.co\/embed\/v1\/widget.min.js');\n<\/script>\n<!-- End Stockist.co widget -->"
      }
    },
    "1646836908e37ecedd": {
      "type": "rich-text",
      "settings": {
        "full_width": true,
        "section_title": "",
        "text": "<p>Interested in becoming an Allo retailer yourself? Please head over to <a href=\"https:\/\/www.lionlabs.co.nz\" target=\"_blank\" title=\"LION LABS NZ\"><strong>Lion Labs<\/strong><\/a> and get in touch with one of our representatives.<\/p>",
        "text_size": "medium"
      }
    }
  },
  "order": [
    "main",
    "1646836839fc4967a7",
    "16468368138fec8529",
    "1646836908e37ecedd"
  ]
}