The Mailspring Theme Blood is a theme for the Mailspring email client.
Open Mailspring and install the theme by going to Mailspring > Install New Theme...
and selecting the directory.
.
├── styles # All stylesheets
| ├── index.less # Main LESS file to import your stylesheets
│ ├── ui-variables.less # UI variables that override N1's defaults
│ ├── theme-colors.less # Theme colors for theme preview (optional)
├── package.json # Metadata about the theme
├── LICENSE.md # License with usage rights
└── README.md # Info about your theme and how to use it