THIRDEYE-599 : Add support for ratio of metrics to thirdeye-reporting

RB=566800
R=kgopalak,gbrandt,dpatel
A=gbrandt

Author: Neha Pawar

thirdeye/thirdeye-reporting/src/main/java/com/linkedin/thirdeye/reporting/api/ReportEmailCssSpec.java

@@ -3,11 +3,11 @@
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
 
 import org.apache.commons.io.IOUtils;
 
-import com.linkedin.thirdeye.reporting.ThirdEyeReportingApplication;
-
 public class ReportEmailCssSpec {
 
   private String timeTitleStyle;
@@ -191,9 +191,9 @@ public String getAnomalyCell3() {
   private String loadCss(String cssFile) throws IOException {
 
     String css = null;
-    ClassLoader classLoader = Thread.class.getClassLoader();
-    InputStream is = classLoader.getResourceAsStream("assets/css/" + cssFile);
-
+    //InputStream is = ClassLoader.getSystemResourceAsStream("assets/css/" + cssFile);
+    URL resource = getClass().getClassLoader().getResource(cssFile);
+    InputStream is = resource.openStream();
     try {
       css = IOUtils.toString(is);
     } finally {