Hi there,
I have just added css on file style.css ( child-theme) to edit color of calendarfor you, please recheck.
Find code:
.ui-widget.ui-widget-content .ui-widget-header {
background-color: #ed3237 !important;
border-color: #ed3237 !important;
}
Then edit #ed3237 = your-code-color
I changed the main color for your site too.
If you need to help, please let me know.
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