Default page
From your Shopify admin, go to Online Store -> Themes.
Find the theme that you want to edit, and then click Customize.
Choose Pages from the dropdown window -> Choose Default page.
From the side menu, select Page. Configure the default page in the setting on the side with the following settings.
Section width
Select the section width from the dropdown menu:
Full width
Page width
Customized width
Customize width
Determines the width of the section when you choose "Customized width" option. Can be from 1000px to 1800px, increasing arithmetically of 50px (pixel).
Section padding
Top padding
Determines the height of the top inner space of the section. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).
Bottom padding
Determines the height of the bottom inner space of the section. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).
Top padding on mobile
Determines the height of the top inner space of the section on mobile. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).
Bottom padding on mobile
Determines the height of the top inner space of the section on mobile. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).