n is used to indicate where a number can be used. Don't forget to add a "%" or "px" after the number. Remember to use American spellings.
selector {
property: value;
}
selector {
color: red;
background-color: #ff0000;
}
selector {
background-image: url(http://thisisanimage.jpg);
background-position: top left;
top center;
top right;
center left;
center center;
center right;
bottom left;
bottom center;
bottom right;
n n;
background-repeat: repeat;
repeat-x;
repeat-y;
no-repeat;
}
selector {
font-family: Font Name;
font-size: n;
font-style: normal;
italic;
oblique;
font-weight: lighter;
normal;
bold;
bolder;
line-height: normal;
n;
letter-spacing: normal;
n;
text-align: left;
right;
center;
justify;
text-decoration: none;
underline;
line-through;
text-transform: none;
capitalize;
uppercase;
lowercase;
}