https://webdesign.tutsplus.com/ko/tutorials/the-holy-grail-of-css-centering--cms-22114

<div class="outer">

<div class="inner">

<div class="centered"><?=$reportPageRepairInfo[0]['repair_way']?></div>

</div>

</div>

<div class="outer"> 

<div class="inner">

<div class="centered centered_sub"><?=$reportPageRepairInfo[1]['repair_way']?></div>

</div>

</div>

.outer {

display:table;

width:100%;

height:50%;

}

.inner {

display:table-cell;

vertical-align:middle;

text-align:center;

}

.centered {

position:relative;

display:inline-block;

width:100%;

padding:1em;

}

.centered_sub {

border-top:1px solid #e1e1e1;

}