.text-divider {
  width: 60%;              /* key change */
  margin: 2rem auto;       /* centers it */
  display: flex;
  align-items: center;
  text-align: center;
}

.text-divider span {
  font-size: 0.9375rem;
  white-space: nowrap;
  padding: 0 1rem;
}

.text-divider::before,
.text-divider::after {
  content: '';
  height: 1px;
  flex-grow: 1;            /* fills remaining space */
  background: hsl(240, 4%, 90%);
}