Created new main card and created a container for inner element of main page.

src/routes/+layout.svelte

@@ -1,4 +1,22 @@
+<style>
 
+    .main-container {
+        margin-left: 10%;
+        margin-right: 10%;
+    }
+
+    nav {
+        position: relative;
+        overflow:visible;
+        display: flex;
+        justify-content: center;
+        gap: 1.5em;
+        padding: 0em 0em 1.5em 0em;
+        z-index: 2;
+        height: 1.5em;
+        border-radius: 4px;
+    }
+</style>
 
 <nav>
     <a href = "test">//tab</a>
@@ -6,4 +24,8 @@
     <a href = "test">//tab</a>
 </nav>
 
-<slot />
+<div class="main-container">
+
+    <slot />
+
+</div>