<div class="price">
<sup>$</sup> 00 <sub>per month</sub>
</div>
.price {
display: flex; align-items: baseline; justify-content: center;
}
.price sup {
position: relative; top: -10px; margin-right: 2px;
}
.price sub {
position: relative; top: -2px; margin-left: 5px;
}
display: flex; flex-wrap: wrap; justify-content: space-between;
width: calc(50% - 10px);