added btn class into btn-like and btn-bookmark

src/client/styles/scss/atoms/_buttons.scss

@@ -26,8 +26,8 @@
   border-radius: 35px;
 }
 
-.btn-like,
-.btn-bookmark {
+.btn.btn-like,
+.btn.btn-bookmark {
   font-size: 1.2em;
   line-height: 0.8em;