Add extra styles for buttons

- to maintain the existing look and feel after switching links to buttons

src/popup/scss/buttons.scss

@@ -86,3 +86,13 @@
         }
     }
 }
+
+button.box-content-row {
+    display: block;
+    width: 100%;
+    background: none;
+}
+
+button {
+    border: none;
+}