=== Add a border around the selected dates===
<code>.datestay{border: 1px solid #2f2f2f !important;}</code>
<span class="" style="color: #f3e504; font-size: 250150%;" >{{#fas:lightbulb}} </span> If you use split dates the CSS is:
<code>.prevdatestay, .datestay{border: 1px solid #2f2f2f !important;}</code>