Where i can set variables in css

May I ask where the variable values are set in css admin? For example:

#sidebar
{
    flex: 0 0 var(--sidebar-width);
    background-color: var(--sidebar-background-color);
    box-shadow: inset 0 0 .5em rgba(0, 0, 0, 0.05);
    padding-left: 50px;
}

Thanks
includes/templates/default.admin/css/app.min.css
Yes, thank you, but background-color: var(--sidebar-background-color); is it from the sidebar-background-color variable, where is it set please?
tim
Use your browser's built in developer tools to inspect the elements you want to style.

Press F12 to open the developer console sidebar in your browser and reload the page.
Right click an element you want to change and select "Inspect Element".
The developer tools sidebar will now show you the current stylings of an element and in which .css file (or .less) and line number it can be found.

E.g. app.css:123 means line 123 in app.css. The CSS files are located in /includes/templates/*.catalog/css/.


https://www.litecart.net/en/knowledgebase/11/how-do-i-know-which-stylesheet-file-and-line-to-edit-for-making-css-adjustments