Make button shadow togglable

src/components/input/button.vue

@@ -3,6 +3,7 @@
         class="button" 
         :class="{
             'is-loading': loading,
+            'has-no-shadow': !shadow,
             'is-primary': type === 'primary',
             'is-outlined': type === 'secondary',
             'is-text is-inverted has-no-shadow underline-none': type === 'tertary',
@@ -30,6 +31,10 @@ export default {
             type: Boolean,
             default: false,
         },
+        shadow: {
+            type: Boolean,
+            default: true,
+        },
     },
 }
 </script>