changed line-height for adjust to center

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

@@ -29,7 +29,7 @@
 .btn.btn-like,
 .btn.btn-bookmark {
   font-size: 1.2em;
-  line-height: 0.8em;
+  line-height: 1em;
 
   &.active,
   &:hover {