Create custom theme

Guide

--sh-background
Background
--sh-class
Classes, numbers and null
--sh-identifier
Identifiers (e.g. variables, functions)
--sh-sign
Symbols
--sh-property
Property names
--sh-entity
Entities (e.g. HTML tags)
--sh-jsxliterals
JSX literals
--sh-string
Strings
--sh-keyword
Keywords (e.g. if, while, function)
--sh-comment
Comments