殆ど使わないタグを一つの機能に特化させる。例えば、中央指定。

/*var is center one*/
.var,[var],var{display:flex;justify-content:center;align-items:center}

全部

/*var is center one*/
.var,[var],var{display:flex;justify-content:center;align-items:center}

/*debug*/
var{
  position:fixed; top:30px; right:400px;
  width:200px;height:200px;
  background-color:rgba(0,0,0,0.05); 
}
<var><b>xyz aaa bbb</b></var>
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