كيف احط خلفية عند مرور المؤشر على الفئات و.....!

.alt1Active:hover {
background:#000;
-webkit-transition: all 2.0s ease-in-out;
-moz-transition:all 2.0s ease-in-out;
-o-transition: all 2.0s ease-in-out;
}
.alt1Active {
-webkit-transition: all 2.0s ease-in-out;
-moz-transition:all 2.0s ease-in-out;
-o-transition: all 2.0s ease-in-out;
}