update 3 images and css

assets/style.css

@@ -8,23 +8,27 @@ body, html {
     align-items: center;
 }
 
-header {
-    background-color: #333;
+header nav {
     display: flex;
     align-items: center;
+    flex-grow: 1;
 }
 
 header nav ul {
     display: flex;
+    align-items: center;
+    flex-direction: row;
     list-style: none;
     margin: 0;
     padding: 0;
     justify-content: center;
+    width: 100%;
 }
 
 header nav ul li {
     position: relative;
     margin: unset;
+    flex: 1;
 }
 
 header nav ul li a, header nav ul li p {
@@ -68,13 +72,14 @@ header nav ul li .submenu li a {
     padding: 20px;
 }
 
-footer {
+footer, header {
     background-color: #333;
     color: white;
     text-align: center;
     padding: 10px 0;
     display: flex;
     align-items: center;
+    width: 100%;
 }
 
 h1, h2, h3, h4, h5, h6 {