1. Create a New Snippet

1. Access Your Shopify Admin:
   • Go to your Shopify admin panel.
2. Navigate to Online Store:
   • From the Shopify admin, click on Online Store.
3. Open Theme Code Editor:
   • Click on Themes.
   • Find the theme you’re currently using and click on Actions.
   • Select Edit code from the dropdown menu.
4. Add a New Snippet:
   • In the left sidebar, look for the Snippets directory.
   • Click on Add a new snippet.
   • Name the new snippet sizechart and click Create snippet.
5. Paste the Code:
   • Your new snippet file (sizechart.liquid) will open in the code editor.
   • Replace the existing code with the following code:

<style>
  .sizeguide-button {
    margin-left: auto;
    font-size: 1em;
    color: #000;
    cursor: pointer;
    transition: all 0.3s ease-out;
    text-decoration: underline;
  }
  .sizeguide-button:hover {
    /* text-decoration: none; */
  }
  #sizepopup.overlay {
    position: fixed;
    z-index: 9;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    transition: opacity 500ms;
    visibility: hidden;
    opacity: 0;
  }
  #sizepopup.overlay:target {
    visibility: visible;
    opacity: 1;
  }

  #sizepopup .popup {
    margin: 70px auto;
    background: none;
    border-radius: 5px;
    width: 35%;
    position: relative;
    transition: all 5s ease-in-out;
  }
  #sizepopup img {
    border-radius: 2px;
  }

  #sizepopup .popup h2 {
    margin-top: 0;
    color: #333;
    font-family: Tahoma, Arial, sans-serif;
  }
  #sizepopup .popup .close {
    position: absolute;
    display: inline;
    top: 4px;
    right: 19px;
    transition: all 200ms;
    font-size: 30px;
    font-weight: bold;
    text-decoration: none;
    color: #000;
  }
  #sizepopup .popup .close:hover {
    color: #d9d2c9;
  }
  #sizepopup .popup .content {
    max-height: 30%;
    overflow: auto;
  }
  #sizepopup table {
    width: -webkit-fill-available;
  }
  #sizepopup table,
  #sizepopup tr,
  #sizepopup th,
  #sizepopup td {
    border: 1px solid;
    border-collapse: collapse;
  }
  #sizepopup tr,
  #sizepopup th,
  #sizepopup td {
    padding: 10px 20px;
  }

  #btn-7893103378606,
  #btn-7893106294958 {
    display: none;
  }
  @media screen and (max-width: 700px) {
    #sizepopup .popup .close {
      top: -8px;
      right: 12px;
    }
    #sizepopup .popup {
      width: 93%;
    }
  }
</style>

<div id="sizepopup" class="overlay">
  <div class="popup">
    <a class="close" href="#">×</a>
    <img src="{{ sizechartImg | image_url }}" width="100%" height="100%">
  </div>
</div>

2. Add Size Chart Button in the Theme Editor

1. Open Theme Editor:
   • Go to Online Store > Themes.
   • Click Customize on the theme you're working on.
2. Navigate to the Product Page:
   • Use the theme editor to navigate to a product page (use the page selector at the top).
3. Add a Custom Liquid Section:
   • In the product page layout, click on Add section.
   • Select Custom Liquid.
4. Add the Code for the Size Chart Button:
   • Paste the following code into the Custom Liquid section:

{% if product.metafields.custom.sizechart.value != blank %}
    <a id="btn-{{ product.id }}" class="sizeguide-button" href="#sizepopup">Size Guide</a>
{% endif %}

Save Your Changes:

• Click Save to apply the changes.

3. Include the Snippet in main-product.liquid

1. Locate the main-product.liquid File:
   • In the left sidebar, find and click on Sections.
   • Open main-product.liquid or the relevant file that handles the main product section.
2. Include the Snippet:
   • Scroll to the end of the file and find the line just before the {% schema %} tag.
   • Add the following line:

{% render 'sizechart', sizechartImg: product.metafields.custom.sizechart.value %}