Hello
To amend try adding the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....
.hornav ul.menu > li > a,
.hornav ul.menu > li > span {
font-size: 14px;
}
.hornav ul.menu > li + li {
margin-left: 8px;
}
.hornav > ul > li img {
max-width: 25px;
margin-top: 0;
}
Ciaran