To hide the scroll bar inject following java script in your code:

document.body.style.overflow = ‘hidden’;

    IWebDriver driver = new ChromeDriver();
    IJavaScriptExecutor js = (IJavaScriptExecutor)driver; 
    driver.Navigate().GoToUrl("https://abc.com");
    js.ExecuteScript("return document.body.style.overflow = 'hidden';");

Sample Selenium code