To capitalize a string of text using CSS you can use an inline style tag, e.g.-

<div style="text-transform:capitalize;">
this was typed in lower case and capitalized with css
</div>

To create a (reusable) class, add the following to your style sheet (.css) file;

.captxt { text-transform:capitalize; }

then use the following in your HTML;

<div class="captxt">
this was typed in lower case and capitalized with css
</div>

In addition to capitalize, you can also use CSS to transform text strings to upper case or lower case, e.g.-

.uctxt { text-transform:uppercase; }

or-

.lctxt { text-transform:lowercase; }

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