In CSS how do you change font size of h1 and h2

Question

In a WordPress twenty eleven theme. I want to change the size of headings When I wrap my headings around h1 and h2 tags as follows

<h1>My h1 heading </h1>
<h2> My h2 heading </h2>

The font size of heading in the theme I am using is almost same as content's font except that they are bold. So my headings are not quite prominent.

I guess I would need to change something in the CSS file. Please advise what exactly in need to put in.

Answer 1

h1 {
  font-weight: bold;
  color: #fff;
  font-size: 32px;
}

h2 {
  font-weight: bold;
  color: #fff;
  font-size: 24px;
}

Note that after color you can use a word (e.g. white), a hex code (e.g. #fff) or RGB (e.g. rgb(255,255,255)) or RGBA (e.g. rgba(255,255,255,0.3)).

Answer 2

 h1 { font-size: 150%; }
 h2 { font-size: 120%; }

Tune as needed.

Answer 3

What have you tried? This should work.

h1 { font-size: 20pt; }
h2 { font-size: 16pt; }