fix: do not set custom calendar styles in portal

and change custom calendar example to set a larger font-size

Author: stropitek

docs-site/src/components/Examples/examples.scss

@@ -179,7 +179,8 @@
   border-color: #f00;
 }
 
-.rasta-stripes {
+.rasta-stripes-big {
+  font-size: 1rem !important;
   .react-datepicker__week:nth-child(3n + 1) {
     background-color: #215005;
   }

docs-site/src/examples/ts/customCalendarClassName.tsx

@@ -5,7 +5,7 @@ const CustomCalendarClassName = () => {
     <DatePicker
       selected={selectedDate}
       onChange={setSelectedDate}
-      calendarClassName="rasta-stripes"
+      calendarClassName="rasta-stripes-big"
     />
   );
 };

src/stylesheets/datepicker.scss

@@ -765,27 +765,6 @@ h2.react-datepicker__current-month {
   align-items: center;
   display: flex;
   z-index: 2147483647;
-
-  .react-datepicker__day-name,
-  .react-datepicker__day,
-  .react-datepicker__time-name {
-    width: 3.75em;
-    line-height: 3.75em;
-  }
-
-  @media (max-width: 400px), (max-height: 550px) {
-    .react-datepicker__day-name,
-    .react-datepicker__day,
-    .react-datepicker__time-name {
-      width: 2.5em;
-      line-height: 2.5em;
-    }
-  }
-
-  .react-datepicker__current-month,
-  .react-datepicker-time__header {
-    font-size: $datepicker__font-size * 1.8;
-  }
 }
 
 .react-datepicker__children-container {