Seaside
#66a4b0
Lighter, softer seafoam-blue for airy panels
About Seaside
Seaside feels like morning light sitting on the surface of calm water. It's notably lighter than Atlas Cedar, but it doesn't go as airy as Blue Eye Samurai, so it holds a steady presence without turning washed out. Compared to Finnish Fiord, it's less warm and less cyan-forward, with a cooler, sea-glass undertone that reads clean rather than friendly-coral warm.
I use it when I need that in-between balance for buttons, card headers, and subtle surface fills in dashboards and finance apps. It works well as a secondary UI color in SaaS and health platforms where you want calm reinforcement, not a strong accent. It's also a nice fit for chart backgrounds and annotation pills in light layouts, because it stays legible and doesn't steal focus.
Quirk to watch: on very cool monitors it can lean a touch more gray-blue, so pair it with grays that aren't already too blue or everything starts to feel samey. The upside is that it's the shade I reach for when the layout needs consistent, seaworthy calm across multiple components.
Code snippets
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Contrast checker
WCAG 2.1 contrast ratios. AA requires 4.5:1 for normal text, 3:1 for large. AAA requires 7:1 / 4.5:1.
On White #ffffff
On Gray 100 #f5f5f5
On Gray 900 #18181b
On Black #000000
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