How to get css value in selenium webdriver using java

 import java.util.concurrent.TimeUnit;  
 import org.openqa.selenium.By;  
 import org.openqa.selenium.WebDriver;  
 import org.openqa.selenium.firefox.FirefoxDriver;  
 public class GetCssfontsizecolor {  
   public static void main(String[] a) {  
     // Initialize Firefox driver  
     WebDriver driver = new FirefoxDriver();  
     //Maximize browser window   
     driver.manage().window().maximize();  
     //Go to URL  
     driver.get("https://www.google.com/");  
     //Set selenium webdriver get timeout  
    driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);  
     String font_name, font_size, font_color;  
     // Get font family name  
     font_name = driver.findElement(By.partialLinkText("Gmail")).getCssValue("font-family").trim();  
     // Get font size  
     font_size = driver.findElement(By.partialLinkText("Gmail")).getCssValue("font-size").trim();  
     // Get font color  
     font_color = driver.findElement(By.partialLinkText("Gmail")).getCssValue("color").trim();  
     System.out.println("font-family : " + font_name);  
     System.out.println("font-size : " + font_size);  
     System.out.println("font-color : " + font_color);  
     // Browser close   
     driver.close();  
   }  
 }