Improve top-level spacing in html template

DiscordChatExporter.Core/Exporting/Writers/Html/PreambleTemplate.cshtml

@@ -90,7 +90,7 @@
             display: grid;
             grid-template-columns: auto 1fr;
             max-width: 100%;
-            padding: 0.6rem;
+            padding: 1rem;
         }
 
         .preamble__guild-icon-container {
@@ -118,7 +118,7 @@
         }
 
         .chatlog {
-            margin-top: 0.6rem;
+            padding: 1rem 0;
             width: 100%;
             border-top: 1px solid @Themed("rgba(255, 255, 255, 0.1)", "#eceeef");
             border-bottom: 1px solid @Themed("rgba(255, 255, 255, 0.1)", "#eceeef");