google fonts not working

Hi!

I am a newbie in CSS and have difficulties in getting the Google fonts in use. Do I need to do something else than just to add the font to CSS code like in an example below?

.widget .widget-title {
font-family: ‘Yanone Kaffeesatz’, sans-serif;
font-size: 18px;
font-weight: 700;
color: rgb(201,206,196);
text-transform: lowercase;
}