[TASK] refactor alert messages

frontend/scss/app.scss

@@ -7,3 +7,4 @@
 @import 'components/btns';
 @import 'components/links';
 @import 'components/input';
+@import 'components/alert';

frontend/scss/components/_alert.scss

@@ -0,0 +1,9 @@
+.alert {
+  &-success {
+    @apply bg-[#15803d];
+  }
+
+  &-error {
+    @apply bg-[#f43f5e];
+  }
+}