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CSS

Selectors

Element Selector - Selects elements based on tag name

  p { color: blue; }  /* selects all <p> elements */
  div { margin: 10px; }  /* selects all <div> elements */

Class Selector - Selects elements with specific class

  .container { width: 80%; }  /* selects elements with class="container" */
  .btn-primary { background-color: #007bff; }  /* selects elements with class="btn-primary" */

ID Selector - Selects element with specific ID

  #header { position: fixed; }  /* selects element with id="header" */
  #main-content { padding: 20px; }  /* selects element with id="main-content" */

Universal Selector - Selects all elements

  * { box-sizing: border-box; }  /* applies to all elements */