Style Full Calendar (color all event days and show title on 1st day of event)

Hello,

I really need your help, guys !

I would like to replicate the layout in the site below for the full calendar without using CSS to do it.
https://bogdanradoi.fr/formations/
The CSS targets (the nth column and nth row) + the a html element containing the 1st day of the event which is variable.

Every time I create an event I have to add a CSS block and set the column, row and date of event.

I am also using the category color to color the days of the event.
<li style=”background: #_CATEGORYCOLOR”>#_EVENTLINK
I want the title to be visible only on the 1st day of the event.
I want all the days of the event to be colored.

.em-calendar.fullcalendar tr:nth-of-type(3) td:nth-of-type(2) a[title*=”04/08″] ~ ul li a {
display:block;
position : absolute;
width: 200px;
text-align: start;
}

.em-calendar.fullcalendar tr:nth-of-type(6) td:nth-of-type(1) a[title*=”24/08″] ~ ul li a {
display:block;
position : absolute;
width: 200px;
text-align: start;
}

Please help !

Thank you !

Bogdan

The page I need help with: [log in to see the link]