Heading text typography

How can I change font and size of heading in posts (for Times New Roman)? In the default one, there is no polish letters.

Add this to Theme Options - Other - Custom CSS

h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    font-family: 'Times New Roman';
.container .navbar-brand {
    font-family: 'Times New Roman' !important;

Let me know if some headings/titles remained unchanged.

Thank you, as far as i can see, everything is ok now!