Only add vertical padding for the top of the first blog post and use the same background color throughout.

default_environment/stylesheet/main.css

@@ -1,6 +1,6 @@
 :root {
   --main-max-width: 800px;
-  --site-background-color: #1f1f1f;
+  --site-background-color: #0a0a0a;
   --site-text-color: #fffffc;
   --header-divider-color: #6a687a;
 
@@ -26,7 +26,7 @@
 
 @media (prefers-color-scheme: light) {
   :root {
-    --site-background-color: #e0e0e0;
+    --site-background-color: #f5f5f5;
     --site-text-color: #000003;
     --header-divider-color: #959785;
 
@@ -127,7 +127,15 @@ body {
   /* A blog post in a blog stream (for example, the homepage). */
   .blog_stream_post {
     background: var(--stream-post-background-color);
-    padding: 1rem 0.2rem 0 0.2rem;
+    padding: 0 0.2rem;
+  }
+
+  .blog_stream_post {
+    background: var(--stream-post-background-color);
+  }
+
+  .blog_stream_post:nth-child(1) {
+    padding-top: 1rem;
   }
 
   .blog_post_title {