Most themes paint every element one colour. A multi-colour theme is different: it carries a palette of several colours and gives each branch of your diagram a different one, the way a rainbow mind map tints each main branch a distinct hue. They are perfect for mind maps, org charts, and any diagram where colour helps you tell one limb from another.
What they are
A multi-colour theme holds an ordered palette of colours plus a neutral trunk colour. Branches cycle through the palette, so a diagram with more branches than colours simply repeats hues rather than running out. The backdrop, the canvas background and pattern, works exactly as it does for any other theme; only the element colours change with the branch.
livediagram ships several multi-colour themes, grouped under the picker's Multi-colour category, with feels ranging from a saturated Rainbow spectrum and a soft Pastel version to a vivid Tropical palette, a warm Autumn set, and rich Jewel tones.
How a branch is decided
livediagram works out the branches from your arrows. An arrow whose ends are both pinned to elements defines a parent-to-child link. The roots of the hierarchy, the centre of a mind map or the top of an org chart, take the trunk colour, and each of a root's direct children starts a fresh branch hue that flows down the whole subtree beneath it. So a top-level limb and all of its sub-topics share one colour.
Elements that no arrow touches each pick up the next colour in turn, so even a flat board of scattered shapes gets a spread of hues rather than collapsing to one. Arrows take the colour of the branch they feed into, so each connector matches its limb.
Adding to a multi-colour diagram
A brand-new element you drop on a multi-colour tab is not wired into the hierarchy yet, so it takes the neutral trunk colour. Once you connect it in with an arrow, re-pick the theme or use Reset elements to theme to re-run the branch colouring and give the new limb its proper hue. This is deliberate: livediagram does not silently re-rainbow your whole canvas every time you draw an arrow, which would fight any hand-colouring you have done.
Theme cards show a row of small stripes for multi-colour themes and a single dot for single-colour ones, so you can spot the rainbow themes in the picker at a glance.
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