- 01Setting Up (What You'll Need)
- 02Your First HTML
- 03Lists and Links
- 04Adding Color with CSS
- 05CSS Selectors and Classes
- 06Layout with Flexbox
- 07Trying Out Images and Tables
- 08Trying Out Form Controls
- 09Understanding the Box Model
- 10Intro to Responsive Design (Media Queries)
- 11CSS Variables (Custom Properties)
- 12Layout with CSS Grid
- 13Adding an Animation
- 14How to Write Comments
- 15Adding Interaction with Pseudo-Classes (:hover)
- 16CSS's :not() and Multi-Condition Selectors
- 17The Basics of Meta Tags and SEO
- 18The Basics of Accessibility (alt and aria-label)
- 19Trying Out data Attributes (data-*)
- 20CSS Transitions (Smooth Hover Changes)
- 21iframe (Embedding Another Page)
- 22position (Precisely Positioning an Element)
- 23z-index (Specifying Stacking Order)
- 24The Basics of localStorage (Saving Data in the Browser)
- 25The video and audio Tags (Embedding Media)
- 26Advanced Tables (colspan and rowspan)
- 27The Basics of CSS Specificity
- 28The Basics of SVG (Drawing Vector Images)
- 29Advanced Flexbox (Wrapping and Growing)
- 30Form Validation (required and pattern)
- 31Advanced CSS Grid (grid-template-areas)
- 32The details and summary Tags (Building a Collapsible Panel)
- 33CSS Counters (Automatic Numbering)
- 34Fluid Font Sizes with clamp()
- 35prefers-color-scheme (Dark Mode Support)
- 36Building a Slider with input type=range
- 37Fixing an Aspect Ratio with aspect-ratio
- 38Adjusting How an Image Displays with object-fit
- 39Rotating and Scaling with transform
- 40Serving Responsive Images with the picture Tag
- 41Showing Keyboard Focus with :focus-visible
- 42Scrolling Smoothly with scroll-behavior
- 43Switching Layouts Per-Component with Container Queries
- 44Creating a Frosted-Glass Effect with backdrop-filter
- 45Building a Flexible Grid with repeat() and minmax()
- 46Fixing a Header in Place with position: sticky
- 47Adding Pseudo-Elements with ::before and ::after
- 48Truncating Long Text with an Ellipsis Using text-overflow
- 49Using a Calculated Value in CSS with calc()
- 50[Applied] Build a Simple Website
Adding Interaction with Pseudo-Classes (:hover)
In this lesson you'll learn how to add interaction using pseudo-classes like :hover, so you can build button motion without JavaScript. This is for people searching "CSS hover usage."
A pseudo-class is a mechanism that lets you apply a style only during a specific state, like "while the mouse is hovering over it." :hover is used while the mouse is over an element, and :focus is used while an input field is selected.
The sample code specifies a normal background color on .btn, and the background color for when the mouse hovers over it on .btn:hover, smoothing out the color change with transition. Try actually placing your mouse over the element and watch the color smoothly shift.
A common beginner stumbling block is that the transition paired with :hover needs to be specified on the normal state (.btn) side, not the :hover side. Writing transition on the :hover side instead results in an unnatural motion where only the moment you move the mouse away fails to animate smoothly.
A motion like a button's color changing when you hover the mouse over it can be achieved entirely with CSS, without JavaScript. This is a widely used technique on website buttons as visual feedback that tells the user, "this is clickable."
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