CSS
Layouts from imagination, not from copy-paste.
CSS in depth: the cascade and box model, selectors, Flexbox and Grid, responsive systems, typography, animation and the architecture habits that survive team scale.
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- 1
The Mental Model
Stop guessing why styles apply.
1–2 weeks0/4Origin, specificity and order - the three-step algorithm that resolves every conflict, learned once, used forever.
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Class, attribute, pseudo-class and pseudo-element selectors - targeting precisely without !important.
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Content, padding, border, margin, box-sizing and block vs inline - every element is a box; know its rules.
px vs rem vs %, viewport units and CSS variables - the raw material of themeable systems.
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- 2
Modern Layout
Build any layout from a picture.
2–3 weeks0/4Axes, wrapping, grow/shrink/basis and alignment - one-dimensional layout mastered.
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Tracks, template areas, auto-placement and minmax - entire page scaffolds in a few lines.
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relative/absolute/fixed/sticky and z-index stacking contexts - where 'why is it behind that?' gets answered.
Scroll containers, text truncation and sticky headers - the details that make dense UIs usable.
Build: Layout gauntlet
Rebuild three classic layouts from screenshots: a holy-grail page, a card grid and a chat UI.
- 3
Responsive & Typography
One codebase, every screen - and text that reads well.
2 weeks0/4Breakpoints chosen by content, not device lists - enhancement upward from a working mobile base.
Free resources
clamp(), fluid type scales and component-level breakpoints - responsiveness beyond the viewport.
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Font loading, line length and vertical rhythm - the 90% of design that is text.
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srcset/sizes, aspect-ratio and object-fit - sharp images without blowing the budget.
- 4
Polish & Architecture
Interfaces that feel designed; CSS that survives teams.
2 weeks0/4Micro-interactions on transform/opacity, easing choices and prefers-reduced-motion respect.
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:has(), :is()/:where(), nesting and color functions - today's CSS is a different language than 2015's.
Naming conventions, utility-first (Tailwind) vs component styles - consistency as the real architecture.
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Take the OneRoadmap CSS certification - verified layout skills.
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