# CSS Notes ## Introduction to CSS CSS (Cascading Style Sheets) is used to style and visually format HTML elements. It controls layout, colors, fonts, spacing, and overall presentation of web pages. CSS helps maintain separation between content (HTML) and design (CSS). ## Ways to Apply CSS ### 1. Inline CSS CSS written directly inside an HTML tag.

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Not recommended for large projects. ### 2. Internal CSS CSS written inside a ### 3. External CSS (Preferred) CSS written in a separate .css file. Reusable, clean and professional ## CSS Selectors ### Element Selector p { color: green; } ### Class Selector .box { background-color: yellow; } ### ID Selector #main { width: 100%; } ### Group Selector h1, h2, h3 { font-family: Arial; } ## Colors in CSS ### Color Formats Named colors: red, blue Hex: #ff5733 RGB: rgb(255, 87, 51) RGBA: rgba(0, 0, 0, 0.5) ### Text & Font Styling Common Properties p { font-size: 16px; font-family: Arial, sans-serif; font-weight: bold; text-align: center; } ### Text Decoration a { text-decoration: none; } ## CSS Box Model (Very Important) Every HTML element consists of: Content Padding Border Margin div { padding: 10px; border: 2px solid black; margin: 15px; } Understanding the box model is crucial for layout control. ## Width, Height & Units Units Used px – fixed size % – relative em – relative to parent rem – relative to root element .container { width: 80%; height: 200px; } ## Display Property Common Values block inline inline-block none span { display: inline-block; width: 100px; } ## Position Property (Basics) Types static (default) relative absolute fixed .box { position: relative; top: 10px; left: 20px; } ## Background Styling body { background-color: #f5f5f5; } ### Background image: div { background-image: url("image.jpg"); background-size: cover; }