Universal Calculator for Calc.ist
<! DOCTYPE html > < html lang = " en " > < head > < meta charset = " UTF-8 " /> < meta name = " viewport " content content = " width=device-width, initial-scale=1.0 " /> < title > Zupr Calculator </ title > <!-- Preconnect to Google Fonts for better performance --> < link rel = " preconnect " href = " https://fonts.googleapis.com " > < link rel = " preconnect " href = " https://fonts.gstatic.com " crossorigin > <!-- Adding Google Philosopher font --> < link href = " https://fonts.googleapis.com/css2?family=Philosopher:ital,wght@0,400;0,700;1,400;1,700&display=swap " rel = " stylesheet " > < style > * { box-sizing : border-box ; font-family : 'Philosopher' , sans-serif ; } body { background : linear-gradient ...