I hope the #b and #c keep fixed on the right, while the #a can be flexible according to the parent width.
<div id="flex-container>
<div id="a">
some text, the length is undetermined
</div>
<div id="b">
<!-- width is fixed, 100px -->
</b>
<div id="c>
<!-- width is fixed, 30px -->
</div>
</div>
What should I do?
