Hi, I will Share my ideas.
Here is a piece of code where we can move the mouse pointer to a location and clicking on the moved region
Actions builder = new Actions(driver);
WebElement Element = driver.findElement(By.xpath("//div[@id='signUpModal']"));
builder.moveToElement(Element, 100, 100).click().build().perform();
Note: The Pointer will move with reference to region of element described "Element"(Top left of Element region is considered as 0,0).
For further understanding, you can refer to the Selenium Training.