font-family for all posts

Hi,

I would like to set the default font-family for all my posts as Verdana 14pt so I added this css:

.single .hentry .entry-content {
width: 90% !important;
float: none !important;
font-family: verdana, geneva, sans-serif;
font-size: 14pt;
}

but it doesn’t do what I am expecting because the default size and family in my post is something different and I have to change it manually every time
Any idea what I am doing wrong?

this is my site:
https://slow-data.com/
if you check a post like this one https://slow-data.com/off-the-map/ you could see in the html editor that every time I need to add:
<span style=”font-size: 14pt; font-family: verdana, geneva, sans-serif;”> bla bla </span>

Thanks,
Jacopo