This interactive simple interest calculator uses a standard web form to compute interest based on principal amount, time in years, and interest rate. Users enter three numeric values into separate input fields and trigger the calculation via an HTML button that calls the `calculate()` function. The JavaScript code retrieves the input values using `document.getElementById()`, applies the formula `(principal*time*rate)/100`, and displays the output in a designated heading element. A reset button reloads the page to clear all values. The interface is styled with custom CSS, using absolute positioning and border styling for a clean, basic layout.