wrap(middle)
CSS
BEM
Scss
Sass
Less
Stylus
.css
<div class="wrap xl-middle">
  <div class="col xl-3-12">01</div>
  <div class="col xl-6-12">02</div>
  <div class="col xl-3-12">03</div>
</div>
01
02
03
table
01
02
03
flexbox
01
02
03
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