Your Custom HTML section is a versatile and powerful way for you to personalize your theme and increase the possibilities of your storefront’s layout and content.
HTML is a coding language which affects how your section is displayed by the browser.
Within your Shopify admin, go to Sales Channels > Online Store > Themes.
Click your theme, and select Customize.
On the left-hand menu, select Custom HTML.
Scroll down to select Custom HTML.
Under Content, you will be able to see Custom HTML content blocks on the left-hand menu.
By selecting Add Custom HTML, you can feature up to four content blocks to house your code within this section.
You can drag and drop these content blocks to change the order that these images appear within your gallery.
Under HTML, enter your block of code into the entry field.
Use the Container width drop-down menu to choose a size of your HTML block: