.vertical_header { writing-mode: vertical-rl; transform: rotate(180deg); font-weight: normal; }
 .repeated_head th { padding-top: 0.5em; border-bottom: 1px solid black; }
 .bold { font-weight: bold }
+.date { vertical-align: top; padding-top: 0.5em; }
 </style>
 <title>Berlin's Corona infection numbers, development by districts</title>
 </head>
             print('</tr>')
         print('<tr class="day_row">')
         weekday = calendar.day_name[datetime.date.fromisoformat(date).weekday()]
-        print('<td>%s<br />%s</td>' % (date, weekday))
+        print('<td class="date">%s<br />%s</td>' % (date, weekday))
         print('<td><table>')
         for abbr in ['+', 'Σ', 'Ø', 'i']:
             print('<tr><th><abbr title="%s">%s</abbr></th></tr>' %