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HTML

            
              <div class="latest-posts">
  <h3 class="latest-posts-title">Latest posts - The complicated way with borders and an ad inserted</h3>
  <div class="latest-posts-items">
    <article class="post">
      <h3 class="post-title">The title of the post #1</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #1.
      </div>
    </article>
    <article class="post">
      <h3 class="post-title">The title of the post #2</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #2.
      </div>
    </article>
    <article class="post">
      <h3 class="post-title">The title of the post #3</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #3.
      </div>
    </article>
    <article class="post">
      <h3 class="post-title">The title of the post #4</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #4.
      </div>
    </article>
    <div class="ad-container">
      <div class="ad">The ad is inserted here</div>
    </div>
    <article class="post">
      <h3 class="post-title">The title of the post #5</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #5.
      </div>
    </article>
    <article class="post">
      <h3 class="post-title">The title of the post #6</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #6.
      </div>
    </article>
    <article class="post">
      <h3 class="post-title">The title of the post #7</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #7.
      </div>
    </article>
    <article class="post">
      <h3 class="post-title">The title of the post #8</h3>
      <figure class="post-featured-image">
        <img src="https://via.placeholder.com/350x150"/>
      </figure>
      <div class="post-excerpt">
        This is a short description (a.k.a excerpt) of around a few dozens of characters associated with and for the post #8.
      </div>
    </article>
  </div>
</div>
!

CSS

            
              // Drawing borders for the flexbox grid
@mixin flexbox-grid-borders($items-per-row, $margin-right: 0, $grid-title: false) {
	> * {
		border-right: 1px solid gray;

		@if ($margin-right != 0) {
			padding-right: calc(#{$margin-right} / 2);
			margin-right: calc(#{$margin-right} / 2);
		}
	}

	// Right margins
	@if ($grid-title == true) {
		> *:not(h3) {
			&:nth-child(#{$items-per-row}n + 1) {
				border-right: 0;
				padding-right: 0;
			}
		}
	} @else {
		> * {
			&:nth-child(#{$items-per-row}n) {
				border-right: 0;
				padding-right: 0;
			}
		}
	}
}

// A flexbox grid with margins / column gap set manually 
@mixin flexbox-grid(
	$items-per-row,
	$margin-right: 0,
	$margin-bottom: 0,
	$max-items-to-display: null,
	$grid-title: false,
	$iepx: 0px
) {
	$item-width: percentage(1 / $items-per-row);
	$item-flex-basis: calc(
		#{$item-width} - (((#{$items-per-row} - 1) * #{$margin-right}) / #{$items-per-row * 2}) - #{$iepx}
	);
	display: flex;
	flex-direction: row;
	flex-wrap: wrap;

	> * {
		// Now we can have padding and border for items
		box-sizing: border-box;
		margin-bottom: $margin-bottom;
		margin-right: $margin-right;

		// Only $max-items-to-display number of items will be shown
		@if ($max-items-to-display != null) {
			display: none;

			@for $i from 0 through $max-items-to-display - 1 {
				&:nth-child(#{$i + 1}) {
					display: flex;
				}
			}
		}
	}

	// Right margins
	@if ($grid-title == true) {
		> *:not(h3) {
			width: $item-flex-basis;

			&:nth-child(#{$items-per-row}n + 1) {
				margin-right: 0;
			}
		}
	} @else {
		> * {
			width: $item-flex-basis;

			&:nth-child(#{$items-per-row}n) {
				margin-right: 0;
			}
		}
	}
}

// A responsive grid with flexbox
@mixin responsive-flexbox-grid(
	$margin-right: 0,
	$margin-bottom: 0,
	$borders: true,
	$max-items-to-display-map: null
) {
	@media (max-width: 767px) {
		$max-items-to-display: map-get($max-items-to-display-map, mobile);
		@include flexbox-grid(1, $margin-right, $margin-bottom, $max-items-to-display);
    @include flexbox-grid-borders(1, $margin-right);
	}

	@media (min-width: 768px) and (max-width: 959px) {
		$max-items-to-display: map-get($max-items-to-display-map, tablet);
		@include flexbox-grid(2, $margin-right, $margin-bottom, $max-items-to-display);
    @include flexbox-grid-borders(2, $margin-right);
	}

	@media (min-width: 960px) and (max-width: 1279px) {
		$max-items-to-display: map-get($max-items-to-display-map, laptop);
		@include flexbox-grid(3, $margin-right, $margin-bottom, $max-items-to-display);
    @include flexbox-grid-borders(3, $margin-right);
	}

	@media (min-width: 1280px) {
		$max-items-to-display: map-get($max-items-to-display-map, desktop);
		@include flexbox-grid(4, $margin-right, $margin-bottom, $max-items-to-display);
    @include flexbox-grid-borders(4, $margin-right);
	}
}

// A special mixin to regrid posts for the ad
@mixin latest-posts--regrid-for-ad($max-items-to-display-map, $margin-right) {
	.ad-container {
		width: 100%;
	}

	@media (max-width: 767px) {
		$max-items-to-display: map-get($max-items-to-display-map, mobile);
		$half: round($max-items-to-display / 2);

		> * {
			@for $i from 1 to 9 {
				&:nth-child(#{$i}) {
					@if ($i < $half) {
						order: #{$i};
					}
					@if ($i > $half) {
						order: #{$i + 1};
					}
					@if ($i == 5) {
						order: #{$half};
					}
				}
			}
		}
	}

	@media (min-width: 768px) and (max-width: 959px) {
		$max-items-to-display: map-get($max-items-to-display-map, tablet);
		$half: round($max-items-to-display / 2);

		> * {
			@for $i from 1 to 9 {
				&:nth-child(#{$i}) {
					@if ($i < $half) {
						order: #{$i};
					}
					@if ($i >= $half) {
						order: #{$i + 1};
					}
					@if ($i == 5) {
						order: #{$half};
					}
				}
			}
		}
	}

	@media (min-width: 960px) and (max-width: 1279px) {
		$max-items-to-display: map-get($max-items-to-display-map, laptop);
		$half: round($max-items-to-display / 2);

		> * {
			@for $i from 1 to 9 {
				&:nth-child(#{$i}) {
					@if ($i < $half) {
						order: #{$i};
					}
					@if ($i >= $half) {
						order: #{$i + 1};
					}
					@if ($i == 5) {
						order: #{$half};
					}
					@if ($i == 6) {
						margin-right: calc(#{$margin-right} / 2);
						padding-right: calc(#{$margin-right} / 2);
						border-right: 1px solid gray;
					}
					@if ($i == 7) {
						margin-right: 0;
						padding-right: 0;
						border: none;
					}
				}
			}
		}
	}

	@media (min-width: 1280px) {
		$max-items-to-display: map-get($max-items-to-display-map, desktop);
		$half: round($max-items-to-display / 2);

		> * {
			@for $i from 1 to 10 {
				&:nth-child(#{$i}) {
					order: #{$i};
					display: flex;

					@if ($i == 8) {
						margin-right: calc(#{$margin-right} / 2);
						padding-right: calc(#{$margin-right} / 2);
						border-right: 1px solid gray;
					}

					@if ($i == 9) {
						margin-right: 0;
						padding-right: 0;
						border: none;
					}
				}
			}
		}
	}
}

// Styling posts
@mixin post {
  flex-direction: column;
  
  figure {
    margin: 0;
    
    img {
      max-width: 100%;
      height: auto;
    }
  }
}

// Styling the ad 
@mixin ad-container {
  display: flex;
  justify-content: center;
  
  .ad {
    background-color: black;
    color: white;
    width: 728px;
    height: 90px;
    
    display: flex;
    justify-content: center;
    align-items: center;
    
    @media (max-width: 767px) {
      width: 300px;
      height: 250px;
    }
  }
}

// The main styling
.latest-posts {
  display: grid;
  
  .latest-posts-items {
    
    $max-items-to-display-map: (
			mobile: 2,
			tablet: 5,
			laptop: 7,
			desktop: 9
);
    
    @include responsive-flexbox-grid(1.25em, 1.25em, true, $max-items-to-display-map);
    
    @include latest-posts--regrid-for-ad($max-items-to-display-map, 1.25em);
    
    .post {
      @include post;
    }
    
    .ad-container {
      @include ad-container;
    }
  }
}
!

JS
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