Html Css Javascript Crash Course -

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

// Update button text & save preference if (body.classList.contains('dark')) button.textContent = '☀️ Light Mode'; localStorage.setItem('theme', 'dark'); else button.textContent = '🌙 Dark Mode'; localStorage.setItem('theme', 'light'); html css javascript crash course

.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'

/* style.css */ :root --bg: #f9f9f9; --text: #1e1e2f; --box-bg: #ffffff; --box-border: #ddd; --btn-bg: #1e1e2f; --btn-text: #f9f9f9; transition: all 0.3s ease

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

h1 font-size: 2rem; margin-bottom: 0.5rem;