.table-data {margin:2em auto}
main {text-align:center;}

.plans {
text-align:center;
clear:both;
display:grid;
list-style:none;
grid-gap:2em;
grid-template-columns:auto auto auto;
}
.plans li {
display:block;
border:1px solid var(--border-color);
border-radius:1em;
background:rgba(255,255,255,.5);
padding:1em;
}
.plans strong {
display:block;
margin:-10px 0 10px 0;
}