<div class="b"/><div class="a"/>
    </div>
    <div class="flexbox">
      <div class="c"/><div class="b"/><div class="a"/>
    </div>

    <!-- center -->
    <div class="flexbox">
      <div class="a" style="margin-top: 95px"/>
    </div>
    <div class="flexbox">
      <div class="b" style="margin-top: 70px"/><div class="a"/>
    </div>
    <div class="flexbox">
      <div class="c" style="margin-top: 20px"/><div class="b"/><div class="a"/>
    </div>

    <!-- space-between -->
    <div class="flexbox"