CSS

Syntax and selectors

Relative Units

Document flow and layout

Box Model

Flexbox

Grid

Positioning and stacking context

Responsive design

Cascade Layers

Modular CSS

Container queries

Color and contrast

Typography and spacing

Gradients, shadows, and blend modes

Masks, shapes, and clipping

Transitions

Transforms

Animations

Preprocessors

Images and SVGs

Forms

Creating and styling forms.

Emmet for VSCode

Patterns

Sample styling sheet

Sample styling sheet.