Does anyone have any HTML code suggestions or ways I can reduce the padding (spacing) at the bottom of the End of Survey message?

We have a pop-up intercept survey for a website, and when the questions display, they fit within the intercept window perfectly, but when the survey is completed and the End of Survey message is displayed, the intercept window adds a scroll bar because the padding after the text increases the length of the message. (The actual text would fit within the intercept window size without needed a scroll bar.) We are looking to remove the blank space padding from below the End of Survey message to remove the scroll bar.

Any suggestions would be very helpful. Thank you!