[Theme: Customizr] Add a gallery in homepage

Hello
I am developing a website on localhost using a Customizr child theme, I added a div in the homepage under the header using this snippet https://presscustomizr.com/snippet/adding-block-content-header/
Now, under this div, I want to add a gallery(I have it’s shortcode and php code), what should I do ?
Thanks in advance.