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V3Code’s look is yours to set, right from Settings. No hunting for a theme extension: the color picker is built in.

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Theme Builder

Open Settings → Theme Builder and every part of the editor UI is a color you can pick. Changes apply live as you go. It’s grouped so you’re not staring at a wall of swatches:
  • Accent — Focus/accent (focus rings + primary accent), Links, Badge, Button, Progress/usage.
  • Surfaces — Editor, Sidebar, Bottom panel, Activity bar, Title bar, Status bar, Active tab, Inputs.
  • Text & borders — Text (primary UI text), Muted text (secondary), Borders (separators).
Each swatch opens a full picker (hex or RGB). Reset puts it back to default.
On the built-in grey V3Code themes, some surfaces and accents are managed by the app chrome, so your custom colors apply best on top of another base theme.

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Venom animations

V3Code shows a subtle venom-green motion while the agent works — the composer beam, the sticky-capsule “snake,” and accent glows. It’s on by default. Prefer calm? Turn Venom animations off in Settings for grey-only chrome. It’s recommended if flashing or motion bothers you, and your OS Reduce motion setting turns it off automatically.