I want this Form function in HTML to display the result after the Submit button is clicked. At this time it executes the result when I enter numbers in those three input boxes (Width, Height, Length), but I want to add a submit button and when someone click on it, the result should be shown in a box.

           <form      oninput="x.value=parseFloat(((a.value)*parseFloat(b.value)*parseFloat(c.value))*1.3).toFixed(2)">
                <label for="a">Width (ft)</label>&nbsp
                <input type="number" id="a" value=""><br><br>
                <label for="b">Length (ft)</label>
                <input type="number" id="b" value=""><br><br>
                <label for="c">Height (ft)</label>
                <input type="number" id="c" value=""><br><br>
                <label for="total"> <button> Submit</button></label>
                <output name="x" for="a b c"> </output></p>
            </form>