Zupr

  <! DOCTYPE html > < html lang = " en " > < head > < meta charset = " UTF-8 " > < meta name = " viewport " content = " width=device-width, initial-scale=1.0 " > < title > Ultimate Calculator </ title > < style > :root { --bg-color: #f3f4f6; --text-color: #111827; --display-bg: #f9fafb; --button-bg: #ffffff; --button-hover: #f9fafb; --operation-bg: #3b82f6; --operation-hover: #60a5fa; --equals-bg: #10b981; --equals-hover: #34d399; --clear-bg: #ef4444; --clear-hover: #f87171; --memory-bg: #8b5cf6; --memory-hover: #a78bfa; --function-bg: #6366f1; --function-hover: #818cf8; --history-bg: #f9fafb; --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); } .dark-mode { --bg-color: #111827; --text-color: #f3f4f6; --display-bg: #1f29...