I added rainbow accents to the home page in the preview, on the word tool, the banner, the header and the footer. The purple, cream and yellow look is unchanged. I haven't published anything, and I couldn't run the word tool myself.

Changes

• Word tool:
  • A rainbow stripe sits across the top of the card and under the title.
  • Each tab fills with its own colour when selected: yellow, pink, teal or green.
  • Word groups have coloured bands.
  • Letter tiles use the full rainbow.
  • Dictionary results show green for a valid word and red for an invalid one.
• Text boxes: They are now white with dark text, so they're easy to read.
• Top banner: The letter tiles now cover the full rainbow, and there's a rainbow stripe under the headline.
• Header and footer:
  • Both have a thin rainbow line.
  • The footer tool buttons each light up in a different colour.
• Header links: The header now always shows Unscramble Words, Word Scramble, Check Dictionary and Random Word. Each opens its tab on the home page. I removed the old broken Check Dictionary menu item.
• Theme: I added orange and blue as new accent colours.

Not done

• I didn't colour the other pages (About, Contact, legal pages and Sitemap). You didn't pick which parts to colour, so I only did the home page.
• After you publish, try a few words in each tab. The word list loads from the internet, and I couldn't test that.