removed unneccesary border

removed unneccesary border

.gitignore

@@ -7,3 +7,4 @@ web-ext-artifacts/
 test/dist/*
 ckeditor-build/build/*
 build/
+,idea

src/sidebar/styles.css

@@ -268,8 +268,8 @@ footer {
   width: 100%;
   position: relative;
   margin: 0 auto;
-  border: 1px solid #ccc;
-  border-bottom: 0;
+  border: 0;
+  border-top: 1px solid #ccc;
 }
 
 #migration-note {