How to escape black screen of browser

//Escaping black screen of browser using Action class and with keyboard button in selenium

Actions act = new Actions(driver);

//Sample working  code for login script

public static void main(String[] args)throws InterruptedException {

WebDriver driver = new ChromeDriver();
// driver.manage().window().maximize();
driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
String appurl = "";
WebElement username3 = driver.findElement(By.cssSelector("input[id='email']"));
WebElement password = driver.findElement(By.cssSelector("input[id='pass']"));
Actions act = new Actions(driver);



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