diff --git a/assets/img/Rectangle-9-desktop.webp b/assets/img/Rectangle-9-desktop.webp
new file mode 100644
index 0000000..2530671
Binary files /dev/null and b/assets/img/Rectangle-9-desktop.webp differ
diff --git a/assets/img/Rectangle-9-mobile.webp b/assets/img/Rectangle-9-mobile.webp
new file mode 100644
index 0000000..4775cd9
Binary files /dev/null and b/assets/img/Rectangle-9-mobile.webp differ
diff --git a/css/base/reset.css b/css/base/reset.css
index dc340be..ba34aff 100644
--- a/css/base/reset.css
+++ b/css/base/reset.css
@@ -1,4 +1,9 @@
 /*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
 
  html {
     line-height: 1.15; 
diff --git a/css/layout/header.css b/css/layout/header.css
index aff7c59..18aa821 100644
--- a/css/layout/header.css
+++ b/css/layout/header.css
@@ -2,10 +2,8 @@ header {
     position: absolute;
     width: 100%;
     height: 100px;
-    left: 0px;
     top: 0px;
     background: #000000;
-    margin: auto;
     display: flex;
     align-items: center;
     justify-content: center;
@@ -14,4 +12,6 @@ header {
 header img {
     width: 83px;
     height: 43px;
-}
\ No newline at end of file
+  
+}
+
diff --git a/css/layout/main.css b/css/layout/main.css
index e69de29..6d93bf4 100644
--- a/css/layout/main.css
+++ b/css/layout/main.css
@@ -0,0 +1,18 @@
+.main_banner_desktop,.main_banner_mobile {
+    width: 100%;
+    height: auto;
+    position: absolute;
+    top: 100px;
+}
+
+@media screen and (max-width: 415px) {
+    .main_banner_desktop {
+        display: none;
+    }
+}
+
+@media screen and (min-width: 415px) {
+    .main_banner_mobile {
+        display: none;
+    }
+}
\ No newline at end of file
diff --git a/index.html b/index.html
index 28769db..b8d5c05 100644
--- a/index.html
+++ b/index.html
@@ -21,5 +21,12 @@
            <img src="./assets/img/Logo M3 [branco] (4) 1.svg" alt="Logo M3 Academy"> 
         </a> 
     </header>
+    <main>
+        <section>
+            <img src="./assets/img/Rectangle-9-desktop.webp" alt="Imagem Notebook Desktop" class="main_banner_desktop">
+            <img src="./assets/img/Rectangle-9-mobile.webp" alt="Imagem Notebook Mobile" class="main_banner_mobile">
+        </section>
+    </main>
+    
 </body>
 </html>
\ No newline at end of file