Add space between HTML elements only using CSS

Just use margin or padding.

In your specific case, you could use margin:0 10px only on the 2nd <span>.

UPDATE

Here's a nice CSS3 solution (jsFiddle):

span {
    margin: 0 10px;
}

span:first-of-type {
    margin-left: 0;
}

span:last-of-type {
    margin-right: 0;
}

Advanced element selection using selectors like :nth-child(), :last-child, :first-of-type, etc. is supported since Internet Explorer 9.

A good way to do it is this:

span + span {
    margin-left: 10px;
}

Every span preceded by a span (so, every span except the first) will have margin-left: 10px.

Here's a more detailed answer to a similar question: Separators between elements without hacks

add these rules to the parent container:

display: grid
grid-auto-flow: column
grid-column-gap: 10px

Good reference: https://cssreference.io/

Browser compatibility: https://gridbyexample.com/browsers/

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