diff --git a/calendar/templates/mobile/app.css b/calendar/templates/mobile/app.css
index 75b51156c0..2de89221ad 100644
--- a/calendar/templates/mobile/app.css
+++ b/calendar/templates/mobile/app.css
@@ -256,7 +256,8 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 }
 /* marks a day in the colum-header as today
  */
-.calendar_calToday {
+.calendar_calToday,
+.calendar_calTimeGrid .calendar_calDayColHeader .calendar_calToday.et2_link.et2_clickable {
   background: #ffffcc;
 }
 .calendar_calWeek {
@@ -273,7 +274,8 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 }
 /* marks a day in the colum-header as holiday
  */
-.calendar_calHoliday {
+.calendar_calHoliday,
+.calendar_calTimeGrid .calendar_calDayColHeader .calendar_calHoliday.et2_link.et2_clickable {
   background-color: rgba(103, 159, 210, 0.5);
 }
 /* marks a day in the column-header additionaly as birthday of some contact,
@@ -464,6 +466,7 @@ Hide subsequent headers in week view with non-consolidated owners
   border-bottom: 1px solid silver;
   white-space: nowrap;
   overflow: hidden;
+  background-color: white;
 }
 .hideDayColHeader .calendar_calDayColHeader > div[data-date] {
   position: fixed;
@@ -479,6 +482,12 @@ Hide subsequent headers in week view with non-consolidated owners
 .calendar_calDayColHeader > div[data-date] .short_date {
   display: none;
 }
+/* Keep header dates when showing one week, multiple users */
+.calendar_calTimeGridFixed:not(.calendar_TimeGridNoLabel) .calendar_calDayColHeader > div.et2_clickable.et2_link {
+  position: fixed;
+  width: inherit;
+  margin-top: -1px;
+}
 /* Indicators for offscreen events */
 .calendar_calDayColHeader .hiddenEventBefore,
 .calendar_calDayCol .hiddenEventAfter {
@@ -2005,7 +2014,8 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 }
 /* marks a day in the colum-header as today
 */
-.calendar_calToday {
+.calendar_calToday,
+.calendar_calTimeGrid .calendar_calDayColHeader .calendar_calToday.et2_link.et2_clickable {
   background-color: #ffc200;
 }
 .calendar_calWeek {