#center-wrap {
  width: 100%;
}

#posts-nav-wrap h1 {
  text-align: center;
}

#center-wrap p {
  text-align: start;
  display: block;
}

#post-data-wrap {
  padding: 1rem;
}

@media (max-width: 768px) {
  #center-wrap {
    width: calc(100% - 2rem);

    padding-left: 1rem;
    padding-right: 1rem;
  }
}