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CSS

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HTML 

              
                .header
  %h1 Latest posts
  %span.show-all#show-all
    Show all
    %span.show-all-count#show-all-count
  
.items#items
  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/1.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/2.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/3.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/4.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/5.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
 
  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/1.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/2.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

  .item
    %img.item-image{:src => 'https://assets.iamsteve.me/placeholder/3.jpg'}
    %h2.item-title Lorem ipsum dolor sit
    %p.item-description Lorem ipsum dolor sit amet. Elit consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
!

CSS 

              
                $color-one: #f1fafb;
$color-two: #876a96;
$color-three: #d7c1e0;

// Font stack
$system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

body {
  background: $color-one;
  padding: 36px 0;
  font-family: $system;
  line-height: 1.5; }

// Show all adjustments
.items-columns .item {
  flex: 1 1 20%;
  margin-bottom: 24px;
  
  @media (max-width: 799px) {
    flex-basis: 30%; }

  @media (max-width: 539px) {
    flex-basis: 50%; } }

// Flickity adjustments
.flickity-enabled.items {
  display: block;
  margin: 0 -24px; }

.flickity-viewport {
  margin: 0 24px; }

.flickity-enabled.items .item {
  width: 25%;
  
  @media (max-width: 539px) {
    width: 30%; }
  
  @media (max-width: 539px) {
    width: 48%; } }

// Items wrapper styles
.items {
  display: flex;
  flex-flow: row nowrap;
  justify-content: space-between;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  -ms-overflow-style: -ms-autohiding-scrollbar;
  padding: 12px 24px 24px; }

.items-columns {
  flex-flow: row wrap;
  margin-bottom: -24px;
  padding-right: 0; }

// Item basic styles
.item {
  background: #fff;
  border-radius: 8px;
  box-shadow: 
    0 1px 1px rgba(#29435C, .2),
    0 6px 12px -6px rgba(#29435C, .4);
  
  flex: 0 0 280px;
  margin-right: 24px; }

.item-image {
  display: block;
  width: 100%;
  height: 40vh;
  max-width: 100%;
  max-height: 196px;
  object-fit: cover;
  border-radius: 8px 8px 0 0; }

.item-title {
  font-size: 16px;
  color: #666;
  margin: 0 0 6px;
  padding: 24px 24px 0; }

.item-description {
  font-size: 14px;
  margin: 0;
  padding: 0 24px 24px;
  color: #999; }

.header {
  display: flex;
  flex-flow: row nowrap;
  justify-content: space-between;
  align-content: center;
  align-items: center;
  padding: 12px 24px;
  
  h1 {
    margin: 0;
    font-weight: 700;
    font-size: 21px;
    color: $color-two; } }

.show-all {
  font-size: 14px;
  font-weight: 700;
  color: $color-two;
  cursor: pointer;
  padding: 6px;
  border-radius: 4px;
  transition: .2s; }

.active {
  background: $color-two;
  color: $color-three; }

/*! Flickity v1.1.1
https://flickity.metafizzy.co
---------------------------------------------- */
.flickity-enabled {
  position: relative; }

.flickity-enabled:focus { 
  outline: none; }

.flickity-viewport {
  position: relative;
  height: 100%; }

.flickity-slider {
  position: absolute;
  width: 100%;
  height: 100%; }

/* Draggable */
.flickity-enabled.is-draggable {
  -webkit-tap-highlight-color: transparent;
          tap-highlight-color: transparent;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none; }

.flickity-enabled.is-draggable .flickity-viewport {
  cursor: move;
  cursor: -webkit-grab;
  cursor: grab; }

.flickity-enabled.is-draggable .flickity-viewport.is-pointer-down {
  cursor: -webkit-grabbing;
  cursor: grabbing; }
!

JS 

              
                function is_touch_device()
{
  // Checks for existence in all browsers and IE 10/11 & Surface
  return 'ontouchstart' in window || navigator.maxTouchPoints;
}

var all = document.getElementById('show-all');
var items = document.getElementById('items');

// Add value to counter
var count = items.children.length;
var counter = document.getElementById('show-all-count');
counter.innerText = ' (' + count + ')';

// Flickity related
if (!is_touch_device())
{
  var options = {
    cellAlign: 'left',
    freeScroll: true,
    prevNextButtons: false,
    pageDots: false,
    contain: true
  };
  var isFlickity = true;
  var flickity = new Flickity(items, options);
}

// Toggle active states and flickity
all.addEventListener('click', function() {
  this.classList.toggle('active');
  items.classList.toggle('items-columns');
  
  if (!is_touch_device())
  {
    if (isFlickity) flickity.destroy();
    else flickity = new Flickity(items, options);

    isFlickity = !isFlickity;
  }
});
!
999px

Console