Hello Alex, see below

<xsl:template match="/">
        <!-- Use the applicaple root variable here ($absRoot to search entire solution, $siteRoot within current site) -->
        <article class="post">
        <xsl:for-each select="$absRoot//*[name() = $documentTypeAlias][not(umbracoNaviHide = 1)]">
            <xsl:sort select="@createDate" order="descending" />
            <xsl:if test="position() &lt;= $itemsToDisplay">
                    <header>
        <div class="title">
                  <h2><xsl:value-of select="postTitle" /></h2>  
            <p><xsl:value-of select="shortDescription" /></p>
                </div>
    </header>
            <a class="image featured" href="{umbraco.library:NiceUrl(@id)}">
                <xsl:variable name="sm" select="umbraco.library:GetMedia(postImage, 0)" />
                    <xsl:variable name="dt" select="umbraco.library:JsonToXml($sm/umbracoFile)" />  
                    <img src="/imageGen.ashx?image={$dt/src}" /></a>
                                <p><xsl:value-of select="postContent" /></p>
                                <footer>
                                    <ul class="actions">
                                        <li>
                                        <a class="button large" href="{umbraco.library:NiceUrl(@id)}">Continue Reading</a>
                                        </li>
                                    </ul>
                                </footer>
            </xsl:if>
        </xsl:for-each>
        </article>
    </xsl:template>