div width: 100px; height: 100px; padding: 20px; border: 1px solid #000; margin: 10px;
: Understand that CSS is designed to be flexible; avoid forcing fixed widths or heights that break responsiveness. Think in Relationships
The most common source of layout surprises is the difference between box-sizing: content-box (default) and box-sizing: border-box . CSS Demystified Start writing CSS with confidence
Use padding on the parent instead, or use display: flex (flex items don’t collapse margins the same way).
button background-color: blue;
Example:
Open your browser’s developer tools (F12). The panel shows computed styles, lets you toggle rules on/off, and even edit them live. When something goes wrong, inspect the element – you’ll see exactly which rule is winning and why. div width: 100px; height: 100px; padding: 20px; border:
.card background: white; border-radius: 0.75rem; overflow: hidden; box-shadow: 0 2px 6px rgba(0,0,0,0.1); transition: transform 0.2s ease;
: Write your CSS from least specific to most specific . Start with element selectors for base styles, then classes for components, and IDs or more specific class chains for exceptions. .card background: white