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.tags {
list-style: none !important;
margin: 0;
overflow: hidden; 
padding: 0;
display: inline-flex;
}


.tag {
background: #808080;
border-radius: 3px 0 0 3px;
color: #fff;
display: inline-block;
height: 26px;
line-height: 26px;
padding: 0 20px 0 23px;
position: relative;
margin: 0 10px 10px 0;
text-decoration: none;
-webkit-transition: color 0.2s;
margin-left: 5px;
}

.tag::before {
background: #fff;
border-radius: 10px;
box-shadow: inset 0 1px rgba(0, 0, 0, 0.25);
content: '';
height: 6px;
left: 5px;
position: absolute;
width: 6px;
top: 10px;
}

.tag::after {
background: #fff;
border-bottom: 13px solid transparent;
border-left: 10px solid #808080;
border-top: 13px solid transparent;
content: '';
position: absolute;
right: 0;
top: 0;
}

<ul class="tags">
Tags: {{#each article.labels}}
<li class="tag">{{identifier}}<li>
{{/each}}
</ul>