some program table simplifications

index.html

@@ -311,7 +311,7 @@
 <tr valign="top"><td align="right"><a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=2021-11-02T06:00:00">7:00</a></td><td colspan="2", style="padding:5pt"><b >Breakfast</b></td></tr>
 <tr valign="top"><td align="right"><a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=2021-11-02T07:50:00">8:50</a></td><td colspan="2", style="padding:5pt"><b >Opening</b></td></tr>
 
-<tr style="background-color:#fafcff", valign="top">
+<tr>
 <td align="right">9:00</td>
 <td></td>
 <td align="left">Session 1. Chair <i>Roland Glück</i></td>
@@ -353,7 +353,7 @@
 
 <tr valign="top"><td align="right"><a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=2021-11-02T09:30:00">10:30</a></td><td colspan="2", style="padding:5pt"><b >Coffee break</b></td></tr>
 
-<tr style="background-color:#fafcff", valign="top">
+<tr>
 <td align="right">11:00</td>
 <td></td>
 <td align="left">Session 2. Chair <i>Sam van Gool</i></td>
@@ -396,7 +396,7 @@
 
 <tr valign="top"><td align="right"><a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=2021-11-02T11:30:00">12:30</a></td><td colspan="2", style="padding:5pt"><b >Lunch</b></td></tr>
 
-<tr style="background-color:#fafcff", valign="top">
+<tr>
 <td align="right">14:00</td>
 <td></td>
 <td align="left">Session 3. Chair <i>Silvio Ghilardi</i></td>
@@ -461,7 +461,7 @@ In the talk I will discuss the above and some other results.
 
 <tr valign="top"><td align="right"><a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=2021-11-02T14:30:00">15:30</a></td><td colspan="2", style="padding:5pt"><b >Coffee break</b></td></tr>
 
-<tr style="background-color:#fafcff", valign="top">
+<tr>
 <td align="right">16:00</td>
 <td></td>
 <td align="left">Session 4. Chair <i>Uli Fahrenberg</i></td>