If you are a git user, you can install the theme and keep up to date by cloning the repo:
$ git clone https://github.com/dracula/ida.git
Download using the GitHub .zip download option and unzip them.
Create a folder called dracula in IDA themes folder
Move the file
theme.css to dracula folder
mv theme.css ~/.ida.../themes/dracula/
Open your IDA >= 7.3
Colors Click on the box Current theme > Select
Receive updates about this theme and more about Dracula.
This theme wouldn't exist without these people. Wanna help too? Check the repository on GitHub.