<h1>Very loose letterspacing</h1>
<h2>Loose letterspacing</h2>
<h3>Default letterspacing</h3>
<h4>Tight letterspacing</h4>
<h5>Very tight letterspacing</h5>

@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:200,300,400,700,900);

html {
  font-family: 'Source Sans Pro', 'Helvetica Neue', sans-serif;
  padding: 40px 40px 0;
}

h1, h2, h3, h4, h5, h6 {
  font-size: 28px;
  margin: 0 0 10px;
}

h1 {
  font-weight: 200;
  letter-spacing: 0.1125em;
}

h2 {
  font-weight: 300;
  letter-spacing: 0.075em;
}

h3 {
  font-weight: 400;
}

h4 {
  font-weight: 700;
  letter-spacing: -0.01em;
}

h5 {
  font-weight: 900;
  letter-spacing: -0.025em;
}