Hello , I would like to know if you can put a slide at the page to show the underlying background . thanks

Please make an illustration, I dont know what do you mean!

I intend to set up my website in this way .
www.joomlacsszengarden.com/joomla16/index.php/background-styler
Sorry but I have difficulty with the English language

I try to explain myself better by referring to a topic that I read .
www.joomlaplates.com/forum/j3-snowflake/...-background-to-black
In my case , I do not want to turn the page in black , but I would leave it blank and add only a transparency .
In this way the pages can glimpse the background set . as the link that I sent in the previous answer .
Thanks again for the help

Hi again,
first at all: Customizing is your job and our job is to create cool templates!
We are committed to help you with any type of support query, however we can't provide extensive help in terms of customizations. In general customizations may look simple but you will require solid knowledge of web technologies and programming skills to do them or hire a professional who can do it for you.

Anyway if you want to have a transparent background, add the syntax below to your file:
css/custom.css

.white-bg {
background-color: rgba(255, 255, 255, 0.7) !important;
}

Problem solved.