You can either use (on the h4 elements, as they are block by default)
display: inline-block;
Or you can float the elements to the left/rght
float: left;
Just don’t forget to clear the floats after
clear: left;
More visual example for the float left/right option as shared below by @VSB:
<h4>
<div style="float:left;">Left Text</div>
<div style="float:right;">Right Text</div>
<div style="clear: left;"/>
</h4>