You can insert padding… with padding! (or margin for inline elements)
<span>A</span><span>B</span><span>C</span>
CSS:
span {
margin: 0 4px;
}
Actual padding (for borders and stuff):
span {
display: inline-block;
padding: 0 4px;
}
Or, if you're too lazy, you can use letter-spacing.
<span>ABC</span>
CSS:
span {
letter-spacing: 8px;
}