How to assign CSS properties to aside tag

How to assign CSS properties to aside tag

I am trying to change the font family of an aside tag. I created the
following section in my css file -
.instruction {
color: brown;
font: verdana;
}
and assigned aside, class = instruction. But it does not work. I have also
tried using aside as an element in CSS to assign the properties like asign
{property: value;}, but no effect.
But if I only use color property, then it works. So is there any issue
with assigning font family and related properties to aside tag? I am using
Chrome 28.