Fine tune spacings

Author: jperals

src/split-panel/styles.scss

@@ -246,10 +246,6 @@ $app-layout-drawer-width: calc(#{awsui.$space-layout-toggle-diameter} + 2 * #{aw
     flex-grow: 1;
   }
 
-  &-main-row {
-    margin-block-start: calc(#{awsui.$space-scaled-xxs} + 1px);
-  }
-
   &-main-row,
   &-start,
   &-text-and-info {
@@ -271,15 +267,14 @@ $app-layout-drawer-width: calc(#{awsui.$space-layout-toggle-diameter} + 2 * #{aw
     @include styles.font-panel-header;
     padding-block: 0;
     padding-inline: 0;
-    margin-block: 0;
     margin-inline: 0;
+    margin-block: calc(#{awsui.$space-scaled-xxs} + 1px);
   }
 
   &-description {
     color: awsui.$color-text-heading-secondary;
     @include styles.font-body-m;
-    margin-block-start: awsui.$space-scaled-xxs;
-    margin-block-end: 0;
+    margin-block: 0;
   }
 }