fix: styling fixes for day and week view when not using bootstrap

Fixes #951

Author: mattlewis92

projects/angular-calendar/src/modules/day/calendar-day-view.scss

@@ -36,6 +36,10 @@ $cal-day-view-vars: map-merge($cal-vars, $cal-day-view-vars);
 }
 
 .cal-day-view {
+  * {
+    box-sizing: border-box;
+  }
+
   .cal-hour-rows {
     width: 100%;
     border: solid 1px;
@@ -47,7 +51,6 @@ $cal-day-view-vars: map-merge($cal-vars, $cal-day-view-vars);
   mwl-calendar-day-view-hour-segment, /* fix for https://github.com/mattlewis92/angular-calendar/issues/260*/
   .cal-hour-segment {
     display: block;
-    box-sizing: border-box;
   }
 
   .cal-hour-segment::after {

projects/angular-calendar/src/modules/week/calendar-week-view.scss

@@ -78,6 +78,10 @@ $cal-week-view-vars: map-merge($cal-vars, $cal-week-view-vars);
 }
 
 .cal-week-view {
+  * {
+    box-sizing: border-box;
+  }
+
   .cal-day-headers {
     display: flex;
     padding-left: 70px;