.asc {
    background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAFCAYAAACXU8ZrAAAAIklEQVQImWNgQAMGdS//o4thKIBhggqwKsSmAEUhPgUwDADAcUCnOm/sNQAAAABJRU5ErkJggg==) no-repeat 0 3px;
}

.desc {
    background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAkAAAAFCAYAAACXU8ZrAAAAIklEQVQImWMwqHv5nxBmYGBgYCCoAAYIKsCmEKsCZIXoYgC0gkCn5Sd/5QAAAABJRU5ErkJggg==) no-repeat 0 3px;
}

.sort-asc {
    background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAJCAYAAAD6reaeAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAadEVYdFNvZnR3YXJlAFBhaW50Lk5FVCB2My41LjEwMPRyoQAAADBJREFUGFdjQAcGdS//Q5kQABJAEYQJwAWRBcCC6AJgQawqYQCrIAhgFQQBg7qX/wHs4kCnrXBdTQAAAABJRU5ErkJggg==) no-repeat;
}