Event list table

Try putting this in the style.css file of your theme:

.events-table {
border: 1px solid #000;
}

thank you. but it didn’t work.

Looks like it’s remove the outer border but not the inner ones?

In which case, try adding this as well:

.events-table tr {
border: 1px solid #000;
}

no. In fact I just tried to modify the style of every tables, in the style.css of my theme. As I don’t have any other table for the time being on my blog, I tried this way.
This style (with the interior line) is ok for me. But I would like to have a solution concerning only the event table

you can try something like

table.events-table tr {
 border-left: solid #fff 1px;
 border-right: solid #fff 1px;
 border-top: solid #fff 1px;
 border-bottom: solid #fff 1px;
}