Here is a simple calculator implemented in HTML, CSS, and JavaScript: HTML ``` Calculator C DEL 7 8 9 / 4 5 6 * 1 2 3 - 0 . = + ``` CSS (in style.css file) ``` body { font-family: Arial, sans-serif; } .calculator { width: 250px; margin: 50px auto; background-color: #f0f0f0; padding: 20px; border: 1px solid #ccc; border-radius: 10px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); } #display { width: 100%; height: 40px; font-size: 24px; font-weight: bold; text-align: right; padding: 10px; border: none; border-radius: 10px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); } .buttons...