.leadership-tiles .row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;   /* centers partial rows */
}
.leadership-tiles .row > [class*="col-"] {
  flex: 0 1 300px;           /* grow OFF — every box stays 300px */
  max-width: 100%;
  display: flex;
}
.leadership-tiles .row > [class*="col-"] .tile.hover-box {
  flex: 1; width: 100%;
  display: flex; flex-direction: column; justify-content: center;
}