Twitter’s dark mode is about to get darker. In response to a customer’s complaint that Twitter’s dark theme isn’t really black, but more of a blue-ish shade, company CEO Jack Dorsey replied that’s going to be fixed. Though a seemingly minor tweak, dark mode settings for apps have become increasingly popular as a means of conserving battery life on high-end devices and making the apps we use often for long stretches easier on our eyes. The interest in dark themes has grown steadily since Twitter first debuted its own “Night mode” back in mid-2016. A number of apps now support darker themes, including YouTube, Google, Medium, Reddit, Wikipedia, Instapaper, Pocket, IMDb, iBooks, Kindle, Google Maps, Waze, Opera Mini, and many more.