diff --git a/app/static/index.css b/app/static/index.css
index 5bed60f..5ac88dc 100644
--- a/app/static/index.css
+++ b/app/static/index.css
@@ -1,6 +1,12 @@
 .intro{
     text-align: center;
 }
+.head{
+    text-align: center;
+}
+.example{
+    text-align: center;
+}
 a {
     color: green;
 }
\ No newline at end of file
diff --git a/app/static/listing.css b/app/static/listing.css
index e69de29..124dfa5 100644
--- a/app/static/listing.css
+++ b/app/static/listing.css
@@ -0,0 +1,6 @@
+.head{
+    text-align: center;
+}
+table{
+    margin: auto;
+}
\ No newline at end of file