how to create atomic css class code example

Example: Atomic css

<div class="Row">
    <div class=" W(1/2) Bgc(#0280ae.5) H(90px)"></div>
    <div class=" W(1/2) Bgc(#0280ae) H(90px)"></div>
</div>
<div class="D(tb) W(100%)" role="presentation">
    <div class="D(tbc) Bgc(#0280ae) H(90px)"></div>
    <div class="D(tbc) Bgc(#0280ae.5) H(90px)"></div>
</div>
   <div class="IbBox W(50%) Bgc(#0280ae.5) H(90px)"></div><!--
--><div class="IbBox W(50%) Bgc(#0280ae) H(90px)"></div>
<div class="D(f)">
    <div class="Flxg(1) Bgc(#0280ae) H(90px)"></div>
    <div class="Flxg(1) Bgc(#0280ae.5) H(90px)"></div>
</div>