Html Css Javascript Crash Course 【100% Instant】

.demo-box background: var(--box-bg); border: 1px solid var(--box-border); border-radius: 12px; padding: 1.5rem; margin: 2rem 0; transition: 0.2s;

body font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); margin: 0; padding: 2rem; transition: all 0.3s ease;

h1 font-size: 2rem; margin-bottom: 0.5rem; html css javascript crash course

🎯 Goal Build a dynamic "Theme Switcher" page that changes colors when you click a button. 1. HTML (Structure) HTML defines the content and layout.

JavaScript adds logic and user interaction. JavaScript adds logic and user interaction

button:hover transform: scale(1.02); opacity: 0.9;

/* style.css */ :root --bg: #f9f9f9; --text: #1e1e2f; --box-bg: #ffffff; --box-border: #ddd; --btn-bg: #1e1e2f; --btn-text: #f9f9f9; /* style.css */ :root --bg: #f9f9f9

/* Dark theme overrides */ body.dark --bg: #1e1e2f; --text: #f0f0f0; --box-bg: #2a2a3b; --box-border: #444; --btn-bg: #f9f9f9; --btn-text: #1e1e2f;

button background: var(--btn-bg); color: var(--btn-text); border: none; padding: 10px 20px; font-size: 1rem; border-radius: 30px; cursor: pointer; transition: 0.2s;