Slack recently released a dark mode for their Android and iOS apps, and most of the time it works well. Super dark gray backgrounds and light gray fonts, which is much easier in the eyes than dazzling white backgrounds and black text. But there is one thing that is not affected by the new night mode setting – your sidebar.
If you use the new "Dark mode" option in Slack on your iPhone or Android phone and open the sidebar, you may be shocked to see that the background is still white, purple, green or whatever. Definitely not black or super dark gray. On Android, it also applies to the top field that shows your workspace and the search.
The sidebar will not be changed by Slack's dark theme because the sidebar is a customizable animal. Background colors, font colors, brand screens and more can all be adjusted per your preference. This can be done either by using one of Slack's standard color schemes or using your own sidebars. Because you customize this color, Slack thinks you don't want it to change it with the higher contrast setting.
The key to getting a really dark dark position in Slack involved the custom sidebar. We have already shown how to design custom themes on an iPhone or Android phone ̵1; something that cannot be done directly in the mobile app.
Step 1: Finding the Custom Theme Settings
To keep the theme dark mode, when setting custom colors, you want to change the hex codes for the "Column BG" and "Text Color" options. It is the greatest to deal with. You can play with the others to get them how you like them, but the column's background and text is what makes up 90% of the sidebar.
To make things easy, you can only use the custom theme I designed with the help of Slack's dark theme colors as the basis for any of it. Just copy the hex codes below and paste them into the box below the individual color pickers. If you want to adjust the colors according to your own preference, you can do this manually with steps 2 and 3 below.
# 1B1D21, # 474747, # 446680, # D1D2D2, # 474747, # D1D2D2, # 2b7a58, # 266aa6
If you know the hexadecimal six-digit color code you want to use for the sidebar background, press the character field under "Column BG". If not, press the color inside the box and then use the color picker overlay to select the color.
Because you want a dark background, you can go straight black with # 000000 or mimic Slack's dark gray color, # 1B1D21 (the medium dark gray it uses would be # 212428), but I went in between in # 141414, in my example below.
Now, for the font's color does the same thing, but this time you choose a light gray color. Slack uses # D1D2D2 for the light gray text, so please join it. I just went a little narrower on # C7C7C7 in my example below. This will change both the plain text and the bold text when there is an unread message in a channel, thread, or instant message.
Now just test it. Open your Slack app and swipe right or press the Slack icon to open the sidebar. It should match the look of Slack's official "Dark Mode" button.
And don't forget, as with what theme you choose for the sidebar, it will apply to other sloppy versions you use, including the desktop browser, MacOS app, Windows app, or Linux app.