docs: standardize padding and margin for insert-container

Author: MeAkib

adev/src/content/examples/animations/src/app/native-css/insert.css

@@ -5,11 +5,15 @@
 .insert-container {
   border: 1px solid #dddddd;
   margin-top: 1em;
-  padding: 20px 20px 0px 20px;
+  padding: 20px;
   font-weight: bold;
   font-size: 20px;
 }
 
+.insert-container p {
+  margin: 0;
+}
+
 .enter-animation {
   animation: slide-fade 1s;
 }

adev/src/content/examples/animations/src/app/native-css/remove.css

@@ -5,7 +5,7 @@
 .insert-container {
   border: 1px solid #dddddd;
   margin-top: 1em;
-  padding: 20px 20px 0px 20px;
+  padding: 20px;
   font-weight: bold;
   font-size: 20px;
   opacity: 1;
@@ -16,6 +16,10 @@
   }
 }
 
+.insert-container p {
+  margin: 0;
+}
+
 .deleting {
   opacity: 0;
   transform: translateY(20px);