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HTML structure: Create a div with class calculator containing a display area and a div.buttons with all 20 buttons. Each button calls a JavaScript function via onclick .
CSS Grid layout: Use display:grid; grid-template-columns: repeat(4, 1fr) to arrange buttons in a 4‑column grid. Style the display with a dark background and monospace font.
JavaScript logic: Keep the current input in a string variable. The appendValue() function adds characters. clearDisplay() resets to '0' . deleteLast() removes the last character.
Calculation: In calculate() , replace the display symbols (×, ÷, −) with real operators (*, /, -) and use eval() to compute the result. Wrap in a try/catch to handle errors like division by zero.

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