The Logo is set using content block. It could also be set using image block.
To change Image Background: homepage -> gear icon -> custom attributes -> change the Image Background in the bottom part
To change Navbar Background: homepage -> gear icon -> custom attributes -> change the Navbar Background in the bottom part
To change Footer Background: homepage -> gear icon -> custom attributes -> change the Footer Background in the bottom part
Use an "Autonav" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Conversation" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "FAQ" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Feature" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Form" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Image" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Pagelist" block, then choose the desired template under design & custom template => gear icon => custom template
*Note: Use Thumbnail in custom attributes for the images (page settings => attributes => thumbnail)
Use an "Search" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Share This Page" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Social Links" block, then choose the desired template under design & custom template => gear icon => custom template
Use an "Tags" block, then choose the desired template under design & custom template => gear icon => custom template
Simply add a class "btn explore-arrow explore-arrow-border-2 explore-arrow-fill-2" on your <a>or <button> tag.
Example:
<a href="#" class="btn explore-arrow explore-arrow-border-2 explore-arrow-fill-2" >Test Button</a>
For more information about theme colour customisation, go to this document page: Click here