website/_sass/post_content/_post.scss

/**
 * Posts
 */
 .post-header {
    margin-bottom: $spacing-unit;
  }

.post-title {
  @include relative-font-size(2.625);
  letter-spacing: -1px;
  line-height: 1;

  @include media-query($on-laptop) {
    @include relative-font-size(2.25);
  }
}

.post-content {
  margin-bottom: $spacing-unit;

  h2 {
    @include relative-font-size(2);

    &::after {
      content: "";
      display: block;
      border-bottom: 2px solid black;
    }

    @include media-query($on-laptop) {
      @include relative-font-size(1.75);
    }
  }

  h3 {
    @include relative-font-size(1.625);

    @include media-query($on-laptop) {
      @include relative-font-size(1.375);
    }
  }

  h4 {
    @include relative-font-size(1.25);

    @include media-query($on-laptop) {
      @include relative-font-size(1.125);
    }
  }
}

.caption {
  color: $grey-color;
  font-size: $small-font-size;
  padding-bottom: 1.5em;
  text-align: center;
  width: 100%;
}

.relative-posts {
  color: $grey-color-dark;
  display: flex;
  font-size: $small-font-size;
  justify-content: space-between;
  margin-top: 2em;

  a {
      font-size: $base-font-size * 1.2;
  }

  .previous-post {
      text-align: left;
      max-width: 45%;
  }

  .next-post {
      text-align: right;
      max-width: 45%;
  }

  @include media-query($on-laptop) {
      flex-flow: column wrap;
      align-content: center;
      justify-content: center;
      text-align: center;        

      > * {
          margin-top: 2em;
      }

      .previous-post, .next-post {
          text-align: center;
      }
  }
}

.post-meta-icons {
  width: 1.5em; 
  height: 1.5em;
  padding: 0 .2em;
}