Look through the code to get a feel for how the developer originally built the theme. Themes use a mixture of code, including HTML, CSS and Javascript. Tumblr themes use a standard set of blocks ...

The correct code for formatting the description text and positioning it on screen will vary depending on the way the theme has been constructed -- studying the existing HTML and associated CSS ...

The code was spotted by 9to5Google, which reports that a Dark Theme could soon come to the app. Such a move wouldn’t be surprising, since Dark Theme launched on the YouTube website last year .