[CSS] CSS Fundamentals

Introduction to CSS

CSS

• Cascading Style Sheets
• CSS describes the visual style and presentation of the content written in HTML.
• CSS consists of countless properties that developers use to format the content: properties about font, text, spacing, layout, etc.

h1 {
  color: blue;
  text-align: center;
  font-size: 20px;
}

A CSS Rule

• Selector: h1.
• Declaration block: { ... }.
• Declaration(Style): font-size: 20px.
  • Property: font-size.
  • Value: 20px.