Nonostante abbia letto i vecchi post che riguardavano i seguenti errori che riscontro con il mio CSS, continuo ad avere problemi. Chi è così gentile da aiutarmi?

Line : 3 font-family: You are encouraged to offer a generic family as a last alternative
Line : 3 (Level : 1) Family names containing whitespace should be quoted. If quoting is omitted, any whitespace characters before and after the name are ignored and any sequence of whitespace characters inside the name is converted to a single space. : .testo
Line : 3 (Level : 2) font-family: You are encouraged to offer a generic family as a last alternative : .testo
Line : 9 font-family: You are encouraged to offer a generic family as a last alternative
Line : 9 (Level : 1) Family names containing whitespace should be quoted. If quoting is omitted, any whitespace characters before and after the name are ignored and any sequence of whitespace characters inside the name is converted to a single space. : .menu
Line : 9 (Level : 2) font-family: You are encouraged to offer a generic family as a last alternative : .menu
Line : 12 (Level : 1) You have no background-color with your color : .menu
Line : 17 font-family: You are encouraged to offer a generic family as a last alternative
Line : 17 (Level : 1) Family names containing whitespace should be quoted. If quoting is omitted, any whitespace characters before and after the name are ignored and any sequence of whitespace characters inside the name is converted to a single space. : .intro
Line : 17 (Level : 2) font-family: You are encouraged to offer a generic family as a last alternative : .intro
Line : 23 font-family: You are encouraged to offer a generic family as a last alternative
Line : 23 (Level : 2) font-family: You are encouraged to offer a generic family as a last alternative : .copyright
Line : 25 (Level : 1) You have no background-color with your color : .copyright
Line : 30 (Level : 1) You have no background-color with your color : A:link
Line : 32 (Level : 1) You have no background-color with your color : A:visited

Questo è invece il foglio di stile:

.testo {
font-family : Verdana, Arial, Times new roman;
font-size : 12px;
}
.menu {
font-family : Trebuchet MS, Times new roman, Arial;
font-size : 14px;
font-weight : bold;
color : #ffffff;
}
.intro {
font-family : Garamond, Book antiqua, Arial;
font-size : 26px;
}
.copyright {
font-family : Verdana, Arial;
font-size : 10px;
color : #808080;
}
A:link {
text-decoration : none;
}
A:link {
color : #800000;
}
A:hover {
border-bottom : 1px dotted #800000;
}
A:visited {
color : #404040;
}
A:visited {
text-decoration : none;
}


GRAZIE