diff --git a/common/src/ui/MonthBasedCalendar.scss b/common/src/ui/MonthBasedCalendar.scss
index ff58416..b7958b5 100644
--- a/common/src/ui/MonthBasedCalendar.scss
+++ b/common/src/ui/MonthBasedCalendar.scss
@@ -1,5 +1,14 @@
 @import 'bootstrap/scss/variables';
+@import 'bootstrap/scss/mixins';
+@import 'bootstrap/scss/buttons';
+@import 'bootstrap/scss/grid';
+@import './consts';
 
+.Calendar {
+  @include make-container();
+}
+
+/* Calendar head */
 .Calendar-head {
   display: flex;
   justify-content: center;
@@ -47,3 +56,68 @@
 .Calendar-today-button {
   max-width: 5em;
 }
+
+/* Days */
+.Month {
+  margin-left: -$calendar-gutter;
+  margin-right: -$calendar-gutter;
+}
+
+.Month-days {
+  @include make-row($gutter: 0);
+
+  > * {
+    @include make-col-ready();
+  }
+}
+
+.DayOuter {
+  padding: $calendar-gutter;
+}
+
+.DayFiller {
+  display: none;
+}
+
+.DayOuter {
+  display: flex;
+  @include make-col($size: 1, $columns: 2);
+}
+
+.Day, .DayFiller {
+  padding: 0.5em;
+  border-radius: $border-radius;
+}
+
+.Day {
+  flex: 1;
+  border: 1px solid black;
+}
+
+.DayFiller {
+  border: 1px solid transparent;
+}
+
+.Day-name {
+  font-size: 2em;
+  font-weight: 600;
+}
+
+.Day-weekday {
+  font-weight: 600;
+}
+
+.Day-today {
+  background: $gray-300;
+}
+
+/* Weekdays */
+.Month-weekdayHead {
+  display: none;
+}
+
+.WeekdayName {
+  text-align: center;
+  font-weight: 600;
+  font-size: 1.2em;
+}
diff --git a/common/src/ui/SevenDayWeek.scss b/common/src/ui/SevenDayWeek.scss
new file mode 100644
index 0000000..7f0bd0d
--- /dev/null
+++ b/common/src/ui/SevenDayWeek.scss
@@ -0,0 +1,50 @@
+@import 'bootstrap/scss/variables';
+@import 'bootstrap/scss/mixins';
+@import 'bootstrap/scss/grid';
+
+@include media-breakpoint-up(sm) {
+  .DayOuter {
+    @include make-col($size: 1, $columns: 3);
+  }
+}
+
+@include media-breakpoint-up(md) {
+  .DayOuter {
+    @include make-col($size: 1, $columns: 4);
+  }
+}
+
+@include media-breakpoint-up(lg) {
+  .DayOuter {
+    @include make-col($size: 1, $columns: 5);
+  }
+}
+
+@include media-breakpoint-up(xl) {
+  .Month-weekdayHead {
+    display: block;
+    @include make-row($gutter: 0);
+    position: sticky;
+    top: 0;
+    background: white;
+    margin-top: -$spacer * 7.5;
+    padding-top: $spacer * 7.5;
+    z-index: 19;
+  }
+
+  .Month-days {
+    margin-top: $spacer;
+  }
+
+  .DayOuter, .WeekdayName, .DayFiller {
+    @include make-col($size: 1, $columns: 7);
+  }
+
+  .Day-weekday {
+    display: none;
+  }
+
+  .DayFiller {
+    display: block;
+  }
+}
diff --git a/frcal/src/Calendar.scss b/frcal/src/Calendar.scss
index 53a8c8f..f90c2c3 100644
--- a/frcal/src/Calendar.scss
+++ b/frcal/src/Calendar.scss
@@ -7,112 +7,65 @@
 @import '@common/ui/consts.scss';
 @import '@common/ui/MonthBasedCalendar.scss';
 
-.Calendar {
-    @include make-container();
-}
+@include media-breakpoint-up(xs) {
+    .DayOuter.NormalDay {
+        @include make-col($size: 1, $columns: 2);
+    }
 
-.Month-decadeHead {
-    display: none;
-}
-
-.Month-decade {
-    @include make-row($gutter: 0);
-
-    > * {
-        @include make-col-ready();
+    .DayOuter.ComplementaryDay {
+        @include make-col($size: 1, $columns: 1);
     }
 }
 
-.Month-decadeSplitter-small, .Month-decadeSplitter-medium {
-    width: 100%;
-}
-
-.Month-decadeSplitter-medium {
-    display: none;
+@include media-breakpoint-up(sm) {
+    .DayOuter.NormalDay {
+        @include make-col($size: 1, $columns: 3);
+    }
 }
 
 @include media-breakpoint-up(md) {
-    .Month-decadeSplitter-small {
-        display: none;
+    .DayOuter.NormalDay {
+        @include make-col($size: 1, $columns: 4);
+    }
+}
+
+@include media-breakpoint-up(lg) {
+    .DayOuter.NormalDay {
+        @include make-col($size: 1, $columns: 6);
     }
 
-    .Month-decadeSplitter-medium {
-        display: block;
+    .DayOuter.ComplementaryDay {
+        @include make-col($size: 1, $columns: 2);
     }
 }
 
 @include media-breakpoint-up(xl) {
-    .Month-decadeSplitter-medium {
-        display: none;
+    .DayOuter.NormalDay {
+        @include make-col($size: 1, $columns: 8);
     }
+}
 
-    .Month-decadeHead {
+@include media-breakpoint-up(xxl) {
+    .Month-weekdayHead {
         display: block;
         @include make-row($gutter: 0);
+        position: sticky;
+        top: 0;
+        background: white;
+        margin-top: -$spacer * 7.5;
+        padding-top: $spacer * 7.5;
+        z-index: 19;
     }
 
-    .Day-decade {
+    .Month-days {
+        margin-top: $spacer;
+    }
+
+    .DayOuter.NormalDay, .WeekdayName {
+        @include make-col($size: 1, $columns: 10);
+    }
+
+    .Day-weekday {
         display: none;
     }
 }
-
-.Day, .DecadeName, .ComplementaryDay-fake {
-    margin: $calendar-gutter;
-    @include make-col($columns: 10);
-}
-
-@include media-breakpoint-up(lg) {
-    .ComplementaryDays {
-        @include make-row($gutter: 0);
-
-        > * {
-            @include make-col-ready();
-        }
-    }
-
-    .ComplementaryDay, .ComplementaryDay-fake {
-        @include make-col();
-    }
-
-    .ComplementaryDays-splitter {
-        width: 100%;
-    }
-}
-
-.Month, .ComplementaryDays {
-    margin-left: -$calendar-gutter;
-    margin-right: -$calendar-gutter;
-}
-
-.ComplementaryDay {
-    margin-top: $calendar-gutter;
-}
-
-.ComplementaryDay-fake {
-    padding: 0.5em;
-}
-
-.Day {
-    padding: 0.5em;
-    border: 1px solid black;
-    border-radius: $border-radius;
-}
-
-.DecadeName {
-    text-align: center;
-    font-weight: 600;
-    font-size: 1.2em;
-}
-
-.Day-name {
-    font-size: 2em;
-    font-weight: 600;
-}
-
-.Day-decade {
-    font-weight: 600;
-}
-
-.Day-today {
-    background: $gray-300;
-}
diff --git a/frcal/src/Calendar.tsx b/frcal/src/Calendar.tsx
index ecd3ce6..245bc8c 100644
--- a/frcal/src/Calendar.tsx
+++ b/frcal/src/Calendar.tsx
@@ -30,7 +30,7 @@ type DateProps = MonthProps & {
 };
 
 function DecadeName({name}: { name: string }): JSX.Element {
-    return <div className="DecadeName">{name}</div>;
+    return <div className="WeekdayName">{name}</div>;
 }
 
 function DayDetail({jdn}: { jdn: number }): JSX.Element {
@@ -44,9 +44,9 @@ function NormalDay({year, month, day, todayJDN}: DateProps & { todayJDN: number
     const jdn = frJDN(year, month, day);
     const rural = dateRuralName(month, day)!;
     const mobile = useMobileTooltipProps();
-    return <div className={`Day NormalDay ${jdn === todayJDN ? 'Day-today' : ''}`}>
+    return <div className={`Day ${jdn === todayJDN ? 'Day-today' : ''}`}>
         <div className="Day-name">{day}</div>
-        <div className="Day-decade">{decadeNames[(day - 1) % 10]}</div>
+        <div className="Day-weekday">{decadeNames[(day - 1) % 10]}</div>
         <div className="Day-rural"><abbr title={rural.title} {...mobile}>{rural.name}</abbr></div>
         <DayDetail jdn={jdn}/>
     </div>;
@@ -55,22 +55,18 @@ function NormalDay({year, month, day, todayJDN}: DateProps & { todayJDN: number
 function NormalMonth({year, month, todayJDN}: MonthProps & { todayJDN: number }): JSX.Element {
     const decadeHeads = decadeNames.map((name, i) => <DecadeName key={i} name={name}/>);
     return <div className="Month">
-        <div className="Month-decadeHead">{decadeHeads}</div>
-        <div className="Month-decades">{
-            Array.from(Array(3).keys()).map(i => <div key={i} className="Month-decade">{
-                Array.from(Array(10).keys()).map(j => <React.Fragment key={j}>
-                    <NormalDay year={year} month={month} day={i * 10 + j + 1 as FrenchDay} todayJDN={todayJDN}/>
-                    {j % 2 === 1 && <div className="Month-decadeSplitter-small"/>}
-                    {j === 4 && <div className="Month-decadeSplitter-medium"/>}
-                </React.Fragment>)
-            }</div>)
+        <div className="Month-weekdayHead">{decadeHeads}</div>
+        <div className="Month-days">{
+            Array.from(Array(30).keys()).map(i => <div key={i} className="DayOuter NormalDay">
+                <NormalDay year={year} month={month} day={i + 1 as FrenchDay} todayJDN={todayJDN}/>
+            </div>)
         }</div>
     </div>;
 }
 
 function ComplementaryDay({year, month, day, todayJDN}: DateProps & { todayJDN: number }): JSX.Element {
     const jdn = frJDN(year, month, day);
-    return <div className={`Day ComplementaryDay ${jdn === todayJDN ? 'Day-today' : ''}`}>
+    return <div className={`Day ${jdn === todayJDN ? 'Day-today' : ''}`}>
         <div className="Day-name">{dateName(month, day)}</div>
         <DayDetail jdn={jdn}/>
     </div>;
@@ -78,13 +74,13 @@ function ComplementaryDay({year, month, day, todayJDN}: DateProps & { todayJDN:
 
 function ComplementaryDays({year, todayJDN}: { year: FrenchYear, todayJDN: number }): JSX.Element {
     const leap = frIsLeap(year);
-    return <div className="ComplementaryDays">{
-        Array.from(Array(6).keys()).map(i => <React.Fragment key={i}>
-            {(i < 5 || leap) && <ComplementaryDay year={year} month={13} day={i + 1 as FrenchDay} todayJDN={todayJDN}/>}
-            {i === 5 && !leap && <div className="ComplementaryDay-fake"/>}
-            {i % 2 === 1 && <div className="ComplementaryDays-splitter"/>}
-        </React.Fragment>)
-    }</div>;
+    return <div className="Month">
+        <div className="Month-days">{
+            Array.from(Array(leap ? 6 : 5).keys()).map(i => <div key={i} className="DayOuter ComplementaryDay">
+                <ComplementaryDay year={year} month={13} day={i + 1 as FrenchDay} todayJDN={todayJDN}/>
+            </div>)
+        }</div>
+    </div>;
 }
 
 export class Calendar extends MonthBasedCalendar<FrenchYear, FrenchMonth> {
diff --git a/jcal/src/Calendar.scss b/jcal/src/Calendar.scss
index e75be91..be0744b 100644
--- a/jcal/src/Calendar.scss
+++ b/jcal/src/Calendar.scss
@@ -1,122 +1,7 @@
 @import 'bootstrap/scss/functions';
 @import 'bootstrap/scss/variables';
 @import 'bootstrap/scss/mixins';
-@import 'bootstrap/scss/forms';
 @import 'bootstrap/scss/grid';
-@import 'bootstrap/scss/buttons';
 @import '@common/ui/consts.scss';
 @import '@common/ui/MonthBasedCalendar.scss';
-
-.Calendar {
-    @include make-container();
-}
-
-.Month-weekdayHead {
-    display: none;
-}
-
-.Month-days {
-    @include make-row($gutter: 0);
-
-    > * {
-        @include make-col-ready();
-    }
-}
-
-.DayOuter {
-    padding: $calendar-gutter;
-}
-
-.DayFiller {
-    display: none;
-}
-
-.DayOuter {
-    display: flex;
-    @include make-col($size: 1, $columns: 2);
-}
-
-@include media-breakpoint-up(sm) {
-    .DayOuter, .WeekdayName {
-        @include make-col($size: 1, $columns: 3);
-    }
-}
-
-@include media-breakpoint-up(md) {
-    .DayOuter, .WeekdayName {
-        @include make-col($size: 1, $columns: 4);
-    }
-}
-
-@include media-breakpoint-up(lg) {
-    .DayOuter, .WeekdayName {
-        @include make-col($size: 1, $columns: 5);
-    }
-}
-
-@include media-breakpoint-up(xl) {
-    .Month-weekdayHead {
-        display: block;
-        @include make-row($gutter: 0);
-        position: sticky;
-        top: 0;
-        background: white;
-        margin-top: -$spacer * 7.5;
-        padding-top: $spacer * 7.5;
-        z-index: 19;
-    }
-
-    .Month-days {
-        margin-top: $spacer;
-    }
-
-    .DayOuter, .WeekdayName, .DayFiller {
-        @include make-col($size: 1, $columns: 7);
-    }
-
-    .Day-weekday {
-        display: none;
-    }
-
-    .DayFiller {
-        display: block;
-    }
-}
-
-.Month {
-    margin-left: -$calendar-gutter;
-    margin-right: -$calendar-gutter;
-}
-
-.Day, .DayFiller {
-    padding: 0.5em;
-    border-radius: $border-radius;
-}
-
-.Day {
-    flex: 1;
-    border: 1px solid black;
-}
-
-.DayFiller {
-    border: 1px solid transparent;
-}
-
-.WeekdayName {
-    text-align: center;
-    font-weight: 600;
-    font-size: 1.2em;
-}
-
-.Day-name {
-    font-size: 2em;
-    font-weight: 600;
-}
-
-.Day-weekday {
-    font-weight: 600;
-}
-
-.Day-today {
-    background: $gray-300;
-}
+@import '@common/ui/SevenDayWeek.scss';