Simply change Discord's default button colors.
For Powercord or Vizality installation, go to Themes -> Open a CMD / Powershell / Terminal / Gitbash in the folder, and enter the following:
git clone https://github.com/Discord-Theme-Addons/button-recolor
For BetterDiscord:
For Browser / Web:
- Install the Stylus extension for Chrome / Firefox / Opera.
- After installing, head over to this link.
- Press the "Install Style" button.
Inside the root of the file (can be found in ./index.scss on powercord, other platforms it will just be in the file) you can mess with the values as you like. They are done in an RGB (Red, Green, Blue) format, so I recommend using google's colorpicker to get your desired colors. All button colors are sorted by their color.