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About the <head>

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!
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CSS

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CSS Base

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HTML 

              
                <!--
Arlo Web Control Demo - Online Activities List Widget - Theme 2
Documentation: https://developer.arlo.co/doc/webcontrols/onlineactivities
-->

<!-- Target Elements -->
<div class="arlo arlo-online-activities-widget">
  <div class="arlo-online-activities-widget-intro">
    <h1><a href="#widget-online-activities">eLearning</a></h1>
    <h2>Learn online at your own pace. </h2>
    <a href="http://theme2.demo.arlo.co/online-activities-list/" class="arlo-footer-link">View all online activities</a>
  </div>

  <div id="online-activities-list"></div>


</div>

<!-- Templates -->
<script type='text/template' id='online-activities-template'>
  <div class="icons8-tv-show icon-size-80 arlo-icon"></div>
  <div class="arlo-details">
    <h3 class="arlo-name arlo-font-special">
    <a href="<%= ViewUri %>">
      <%= Name %>
    </a>
  </h3>

    <div class="arlo-summary arlo-text-color-light">
      <%= Summary %>
    </div>

    <div class="arlo-offers">
      <%= formatAdvertisedOffers({
     showPriceWithTaxInclusive: true,
     showSingleOffer: false,
     showLabel: true,
     showCurrencyCode: false,
     showMessage: true,
     showTaxRate: true,
     freeText: "Free"
     }) %>
    </div>
  </div>
  <div class="arlo-buttons">
    <%= formatRegistrationInfo('link') %>
  </div>
</script>


<!-- Dependencies -->
<script type="text/javascript" src="//packages.arlocdn.net/jscontrols/1.0/resources/resizesensor.js" charset="utf-8"></script>
<script type="text/javascript" src="//packages.arlocdn.net/jscontrols/1.0/resources/elementqueries.js" charset="utf-8"></script>
<script type="text/javascript" src="//connect.arlocdn.net/jscontrols/1.1/init.js" charset="utf-8" defer="defer"></script>
!

CSS 

              
                html {
  box-sizing: border-box;
}

*,
*::after,
*::before {
  box-sizing: inherit;
}

body {
  margin: 0;
  font-weight: 500;
}

.arlo {
  font-size: 16px;
  font-family: "Source Sans Pro", Arial, Tahoma, sans-serif;
}

.arlo .arlo-loading-overlay {
  position: fixed;
  z-index: 999;
  height: 2em;
  width: 2em;
  overflow: show;
  margin: auto;
  bottom: 50%;
  top: 50%;
  left: 50%;
  right: 50%;
}

.arlo .arlo-loading-overlay:before {
  content: '';
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.3);
}

.arlo .arlo-loading-overlay:not(:required) {
  /* hide "loading..." text */
  font: 0/0 a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}

.arlo .arlo-loading-overlay:not(:required):after {
  content: '';
  display: block;
  font-size: 10px;
  width: 1em;
  height: 1em;
  margin-top: -0.5em;
  -webkit-animation: spinner 1500ms infinite linear;
  animation: spinner 1500ms infinite linear;
  border-radius: 0.5em;
  box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) -1.5em 0 0 0, rgba(0, 0, 0, 0.75) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
}

@-webkit-keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

@keyframes spinner {
  0% {
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

.arlo html {
  font-family: sans-serif;
  /* 1 */
  -ms-text-size-adjust: 100%;
  /* 2 */
  -webkit-text-size-adjust: 100%;
  /* 2 */
}

.arlo body {
  margin: 0;
}

.arlo article,
.arlo aside,
.arlo details,
.arlo figcaption,
.arlo figure,
.arlo footer,
.arlo header,
.arlo main,
.arlo menu,
.arlo nav,
.arlo section,
.arlo summary {
  display: block;
}

.arlo audio,
.arlo canvas,
.arlo progress,
.arlo video {
  display: inline-block;
}

.arlo audio:not([controls]) {
  display: none;
  height: 0;
}

.arlo progress {
  vertical-align: baseline;
}

.arlo template,
.arlo [hidden] {
  display: none;
}

.arlo a,
.arlo a:before,
.arlo a:after {
  background-color: transparent;
  /* 1 */
  -webkit-text-decoration-skip: objects;
  /* 2 */
  -webkit-transition: 0.3s;
  -moz-transition: 0.3s;
  -o-transition: 0.3s;
  transition: 0.3s;
}

.arlo a:active,
.arlo a:hover {
  outline-width: 0;
}

.arlo abbr[title] {
  border-bottom: none;
  /* 1 */
  text-decoration: underline;
  /* 2 */
  text-decoration: underline dotted;
  /* 2 */
}

.arlo b,
.arlo strong {
  font-weight: inherit;
}

.arlo b,
.arlo strong {
  font-weight: bolder;
}

.arlo code,
.arlo kbd,
.arlo samp {
  font-family: monospace, monospace;
  font-size: 1em;
}

.arlo dfn {
  font-style: italic;
}

.arlo h1 {
  font-size: 2em;
  /* Set 1 unit of vertical rhythm on the top and bottom margins. */
  margin: 0.75em 0;
}

.arlo mark {
  background-color: #ff0;
  color: #000;
}

.arlo small {
  font-size: 80%;
}

.arlo sub,
.arlo sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

.arlo sub {
  bottom: -0.25em;
}

.arlo sup {
  top: -0.5em;
}

.arlo img {
  border-style: none;
}

.arlo svg:not(:root) {
  overflow: hidden;
}

.arlo figure {
  margin: 1.5em 40px;
}

.arlo hr {
  box-sizing: content-box;
  /* 1 */
  height: 0;
  /* 1 */
  overflow: visible;
  /* 2 */
}

.arlo pre {
  font-family: monospace, monospace;
  font-size: 1em;
}

.arlo button,
.arlo input,
.arlo optgroup,
.arlo select,
.arlo textarea {
  font: inherit;
  /* 1 */
  margin: 0;
  /* 2 */
}

.arlo button {
  overflow: visible;
}

.arlo button,
.arlo select {
  /* 1 */
  text-transform: none;
}

.arlo button,
.arlo html [type="button"],
.arlo [type="reset"],
.arlo [type="submit"] {
  -webkit-appearance: button;
  /* 2 */
}

.arlo button,
.arlo [type="button"],
.arlo [type="reset"],
.arlo [type="submit"] {
  /**
     * Remove the inner border and padding in Firefox.
     */
  /**
     * Restore the focus styles unset by the previous rule.
     */
}

.arlo button::-moz-focus-inner,
.arlo [type="button"]::-moz-focus-inner,
.arlo [type="reset"]::-moz-focus-inner,
.arlo [type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

.arlo button:-moz-focusring,
.arlo [type="button"]:-moz-focusring,
.arlo [type="reset"]:-moz-focusring,
.arlo [type="submit"]:-moz-focusring {
  outline: 1px dotted ButtonText;
}

.arlo input {
  overflow: visible;
}

.arlo [type="checkbox"],
.arlo [type="radio"] {
  box-sizing: border-box;
  /* 1 */
  padding: 0;
  /* 2 */
}

.arlo [type="number"]::-webkit-inner-spin-button,
.arlo [type="number"]::-webkit-outer-spin-button {
  height: auto;
}

.arlo [type="search"] {
  -webkit-appearance: textfield;
  /* 1 */
  outline-offset: -2px;
  /* 2 */
  /**
     * Remove the inner padding and cancel buttons in Chrome and Safari on OS X.
     */
}

.arlo [type="search"]::-webkit-search-cancel-button,
.arlo [type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

.arlo::-webkit-input-placeholder {
  color: inherit;
  opacity: 0.54;
}

.arlo::-webkit-file-upload-button {
  -webkit-appearance: button;
  /* 1 */
  font: inherit;
  /* 2 */
}

.arlo fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em;
}

.arlo legend {
  box-sizing: border-box;
  /* 1 */
  display: table;
  /* 1 */
  max-width: 100%;
  /* 1 */
  white-space: normal;
  /* 1 */
  color: inherit;
  /* 2 */
  padding: 0;
  /* 3 */
}

.arlo optgroup {
  font-weight: bold;
}

.arlo textarea {
  overflow: auto;
}

.arlo ol,
.arlo ul,
.arlo li {
  list-style: none;
  padding: 0;
  margin: 0;
}

.arlo .arlo-bg-color-primary {
  background-color: #343f56;
}

.arlo .arlo-bg-color-secondary {
  background-color: #343f56;
}

.arlo .arlo-bg-color-filters {
  background-color: #F1F7FB;
}

.arlo .arlo-bg-color-highlight {
  background-color: #FFFDF7;
}

.arlo .arlo-bg-color-normal {
  background-color: #fcfcfc;
}

.arlo .arlo-bg-color-darker {
  background-color: #f7f7f7;
}

.arlo .arlo-bg-color-darkest {
  background-color: #f2f2f2;
}

.arlo .arlo-text-color-primary {
  color: #343f56;
}

.arlo .arlo-text-color-secondary {
  color: #f1992e;
}

.arlo .arlo-text-color-contrast {
  color: #FFFFFF;
}

.arlo .arlo-text-color-lightest {
  color: #bcbcbc;
}

.arlo .arlo-text-color-light {
  color: #969696;
}

.arlo .arlo-text-color-normal {
  color: #5e5e5e;
}

.arlo .arlo-text-color-dark {
  color: #5e5e5e;
}

.arlo .arlo-text-color-link {
  color: #f1992e;
}

.arlo .arlo-font-primary {
  font-family: "Source Sans Pro", Arial, Tahoma, sans-serif;
}

.arlo .arlo-font-secondary {
  font-family: "Source Sans Pro", Arial, Tahoma, sans-serif;
}

.arlo .arlo-font-special {
  font-family: "Montserrat", Arial, Tahoma, sans-serif;
}

.arlo .arlo-font-size-larger {
  font-size: 110%;
}

.arlo .icon-size-80 {
  font-size: 80px;
}

.arlo .arlo-clearfix:after {
  visibility: hidden;
  display: block;
  font-size: 0;
  content: " ";
  clear: both;
  height: 0;
}

.arlo * html .arlo-clearfix {
  zoom: 1;
}

.arlo * {
  box-sizing: border-box;
}

.arlo *:first-child+html .arlo-clearfix {
  zoom: 1;
}

.arlo a {
  color: #f1992e;
  text-decoration: none;
  font-weight: normal;
}

.arlo a:hover {
  color: #f9b420;
}

.arlo .arlo-online-activities-widget-intro {
  text-align: center;
}

.arlo .arlo-online-activities-widget-intro h1 {
  margin-top: 0;
  margin-bottom: 0;
  font-size: 2.7em;
}

.arlo .arlo-online-activities-widget-intro h1 a {
  color: #343f56;
  font-weight: bold;
  text-decoration: none;
}

.arlo .arlo-online-activities-widget-intro h1 a:hover {
  cursor: default;
}

.arlo .arlo-online-activities-widget-intro h2 {
  margin-top: 4px;
  margin-bottom: 4px;
  font-size: 20px;
  font-weight: 300;
  color: #949494;
}

.arlo .arlo-oa-listitems {
  margin: 40px 0;
}

.arlo .arlo-oa-listitem {
  width: 49.5%;
  margin-right: 1%;
  margin-bottom: 20px;
  display: inline-block;
  background: #f5f5f5;
  vertical-align: top;
}

.arlo .arlo-oa-listitem:nth-child(2n) {
  margin-right: 0;
}

.arlo[max-width~="660px"] .arlo-oa-listitem {
  width: 100%;
  margin-right: 0;
}

.arlo .arlo-oa-listitem .arlo-details {
  padding: 30px 10px 0;
  margin-left: 120px;
}

.arlo .arlo-oa-listitem .arlo-icon {
  margin: 30px 30px;
  float: left;
  line-height: 1em;
}

.arlo .arlo-oa-listitem[max-width~="350px"] .arlo-icon {
  display: none;
}

.arlo .arlo-oa-listitem[max-width~="350px"] .arlo-details {
  margin-left: 0;
}

.arlo .arlo-oa-listitem .arlo-name,
.arlo .arlo-oa-listitem .arlo-summary,
.arlo .arlo-oa-listitem .arlo-offers {
  padding: 5px 18px;
}

.arlo .arlo-oa-listitem .arlo-name {
  margin-top: 0;
  margin-bottom: 0;
  line-height: 1.5em;
}

.arlo .arlo-oa-listitem .arlo-name a {
  font-size: 20px;
  color: #565656;
  font-weight: bold;
}

.arlo .arlo-oa-listitem .arlo-name a:hover {
  color: #f1992e;
}

.arlo .arlo-oa-listitem .arlo-summary {
  font-size: 14px;
}

.arlo .arlo-oa-listitem .arlo-buttons {
  text-align: right;
}

.arlo a.arlo-event-register {
  display: inline-block;
  position: relative;
  padding: 10px 25px;
  background-color: #f1992e;
  color: white;
  font-weight: bold;
  font-size: 16px;
  line-height: 20px;
  text-transform: uppercase;
}

.arlo a.arlo-event-register:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  transform: translateX(-100%);
  width: 0;
  height: 40px;
  border-top: 40px solid transparent;
  border-right: 30px solid #f1992e;
}



.arlo a.arlo-event-register:hover {
  background-color: #f9b420;
}

.arlo a.arlo-event-register:hover:before {
  border-right-color: #f9b420;
}
!

JS 

              
                document.addEventListener("arlojscontrolsloaded", function() {
  var platformID = "websitetestdata.arlo.co";

  var onlineActivitiesList = {
    moduleType: "OnlineActivities",
    targetElement: "#online-activities-list",
    template: "#online-activities-template",
    loadMoreButtonText: "Show More",
    maxCount: 2,
    includeLoadMoreButton: false,
    includeArloLink: false,
    customUrls: {
      eventtemplate: "http://theme2.demo.arlo.co/event-template/",
      venue: "http://theme2.demo.arlo.co/venue/",
      presenter: "http://theme2.demo.arlo.co/presenters/"
    },
    filter: {
      templateID: [11,177],
    },
    callbacks: {
      onShow: oaListOnShow
    }
  };

  new window.ArloWebControls().start({
    "platformID": platformID,
    "showDevErrors": true,
    "modules": [onlineActivitiesList]
  });
  
  
   function oaListOnShow(getRenderCollectionElements, $) {
     var listItems = getRenderCollectionElements();
     var listParent = $(listItems[0]).parent()[0];

     ElementQueries.init();

     function setOAListItemsHeight() {
       $(listParent).find(".arlo-oa-listitem").height("auto");
       var tallestListItemHeight = 0;
       $.each($(listParent).find(".arlo-oa-listitem"), function(index, listItem) {
         // Get height from combining heights of list item elements (because of issue with using list items own height)
         var height = 0;
         height += $(listItem).find(".arlo-name").height();
         height += $(listItem).find(".arlo-summary").height();
         height += $(listItem).find(".arlo-offers").height();

         if (height > tallestListItemHeight) {
           tallestListItemHeight = height + 80;
         }
       });
       $("#online-activities-list .arlo-details").css("min-height", tallestListItemHeight);
     }

     setTimeout(function() {
       setOAListItemsHeight();
     }, 1000);

     $(window).bind('resize', function() {
       setTimeout(function() {
         setOAListItemsHeight();
       }, 100);
     });
   }
  
});
!
999px

Console