minor visual fixes

static/css/theme.css

@@ -301,8 +301,8 @@ article {
 
 @media screen and (orientation:portrait) {
     article {
-        font-size: 22px;
+        font-size: 18px;
-        line-height: 28px;
+        line-height: 24px;
     }
 }
 
@@ -405,6 +405,9 @@ article iframe {
     width: 80%;
     aspect-ratio: 4/2.5;
 }
+article iframe{
+    margin:2rem;
+}
 
 article>section>a {
     display: flex;