Corrige pontos no header, menu e newsletter

src/arquivos/sass/components/_newsletter.scss

@@ -4,7 +4,7 @@
 
 	&__wrapper {
 
-		@include mq(lg, min) {
+		@include mq(md, min) {
 			max-width: 698px;
 			margin: 0 auto;
 		}

src/arquivos/sass/partials/_header.scss

@@ -9,6 +9,7 @@
 	@include mq(lg, min) {
 		position: sticky;
 		top: 0;
+		z-index: map_get($z-index, level-5);
 	}
 
 	&.is-fixed {

src/arquivos/sass/partials/_menu.scss

@@ -65,6 +65,7 @@
 			z-index: map-get($z-index, level-5);
 			transform: translateX(-100%);
 			width: 100%;
+			max-width: 375px;
 			height: 100%;
 			background: $white-500;
 			transition: transform .2s ease-in-out;