That's easily done like this:

umb-property[data-element="property-pageTitle"] input[type=text] {
    font-size: 50px;
    height: 70px;
    font-family: Comic Sans MS;
}

Just replace 'pageTitle' with the alias of your property editor. You can do smarter things by convention with selectors like:

umb-property[data-element$="Title"] input[type=text]

(in this case where the property alias ends with 'Title'