Sometimes we feel WordPress Classic H1 font size is too big. How to decrease the font size then?

Login wordress admin panel, go to -> Appearance ->Editor ->Stylesheet (style.css)

Modify:

#header {
 background: #90a090;
 border-bottom: 3px double #aba;
 border-left: 1px solid #9a9;
 border-right: 1px solid #565;
 border-top: 1px solid #9a9;
 font: italic normal 230% ‘Times New Roman’, Times, serif;
 letter-spacing: 0.2em;
 margin: 0;
 padding: 15px 10px 15px 60px;
}

to:

#header {
 background: #90a090;
 border-bottom: 3px double #aba;
 border-left: 1px solid #9a9;
 border-right: 1px solid #565;
 border-top: 1px solid #9a9;
 font: italic normal 160% ‘Times New Roman’, Times, serif;
 letter-spacing: 0.2em;
 margin: 0;
 padding: 15px 10px 15px 60px;
}