add style

src/client/styles/scss/_user.scss

@@ -89,6 +89,8 @@ $easeInOutCubic: cubic-bezier(0.65, 0, 0.35, 1);
   }
 
   .btn.btn-bookmark {
+    width: 50px;
+    height: 50px;
     &.btn-lg {
       font-size: 1.5em;
     }