create a more realistic calculator by adding a display, button layout, and different colours to differentiate between number buttons and operation buttons #176
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sayanbasu2006
changed the title
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Reworked the calculator visuals to mirror the reference: cal.html now uses a compact shell without the headline, featuring a glassy display and a 4×5 grid of circular buttons in the blue/green/yellow/red palette, plus a decorative placeholder to keep the pattern intact. Updated cal.css to deliver the starfield backdrop, rounded chassis, pillowy display, and glossy colour treatments for each button family while keeping them perfectly circular with hover/press depth. Revamped cal.js with operator helpers so the UI shows ×/÷, improved Guard rails (no duplicate operators, limited leading ops), backspace preview updates, division-by-zero handling, and cleaner result formatting during live previews and final computations.