more style tweaks

styles.html

@@ -128,7 +128,6 @@ td {
 }
 header {
   margin-bottom: 4em;
-  text-align: center;
 }
 #TOC li {
   list-style: none;

template.html

@@ -18,6 +18,7 @@
     $endif$
     <title>$if(title-prefix)$$title-prefix$ – $endif$$pagetitle$</title>
     <style>
+      .peertube { margin-bottom: 2em; }
       $styles.html()$
     </style>
     $for(css)$
@@ -109,7 +110,7 @@ $citefile$
       $endif$
 
       $if(peertube)$
-        <div class="text-center">
+        <div class="text-center peertube">
         <iframe width="560" height="315" sandbox="allow-same-origin allow-scripts allow-popups" src="$peertube$"
           frameborder="0" allowfullscreen ></iframe>
         </div>