Make a calculator with pure HTML5 CSS3 and JavaScript!

function useOperator(operator) {    const currentValue = Number(calculatorDisplay.textContent)        // Prevent multiple operators    if (operatorValue && awaitingNextValue) {        operatorValue = operator        return    }    // Assign firstValue if no value    if (!firstValue) {        firstValue = currentValue;    } else {        const calculation = calculate[operatorValue](firstValue, currentValue)        calculatorDisplay.textContent = calculation        firstValue = calculation    }    // Ready for next value, store operator    awaitingNextValue = true;    operatorValue = operator;}

// Add Event Listeners for numbers, operators, decimal buttonsinputBtns.forEach((inputBtn) => {    if (inputBtn.classList.length === 0) {        inputBtn.addEventListener('click', () => sendNumberValue(inputBtn.value))    } else if (inputBtn.classList.contains('operator')) {        inputBtn.addEventListener('click', () => useOperator(inputBtn.value))    } else if (inputBtn.classList.contains('decimal')) {        inputBtn.addEventListener('click', () => addDecimal())    }})