Make the .entry-title larger

Hi

I am trying to make the entry-title larger, without everything else being made lager as well. The below works, with the side effect of all links in the page get larger as well.

a {
  color: #337fda;
  font-size: 1.586em;
  text-decoration: none;
}

This doesn’t work at all

a .entry-title {
  color: #337fda;
  font-size: 1.586em;
  text-decoration: none;
}

I know i’m close, but the solution eludes me. Can anyone help please.