How to change default dark theme?

[ariehen]

You would use a CSS snippet to change the look of the default theme. Give this headache-inducing version a try

body:is(.theme-dark) {
  --bold-color: var(--color-orange);
  --text-highlight-bg: var(--color-blue);
  --text-selection: #4e7919;
}

The colors can be written in a bunch of different ways. Have a look here under “Color Conversion” if you’re not familiar:

#4e7919 hex color

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How to use CSS snippets:

CSS snippets - Obsidian Help