Shopify - Show a percentage discount "on sale" button

product-thumnail.liquid

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{%- assign percentageDiscount = product.compare_at_price_max | minus: product.price | times: 100.0 | divided_by: product.compare_at_price_max | money_without_currency | times: 100 | remove: '.0' -%}

{% if product.compare_at_price_max > product.price %}
  <div class="sale-banner"><span>{{ 'collections.general.sale' | t }}</span><p>{{percentageDiscount}}%<span>OFF!</span></div>
{% endif %}

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snip.css

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.sale_banner {
    position: absolute;
    top:20px;
    left:20px;
    background: #326ca9;
    padding: 0;
    width: 70px;
    height: 70px;
    text-align: center;
    color: #fff;
    font-family: "Gill Sans Nova", sans-serif;
    font-weight: 400;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0px;
    border-radius: 50%;

    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.sale_banner > span{
  line-height: 1;
  display: block;
  color:#a3cfff;
}

.sale_banner p{
  font-size: 24px;
  text-align: center;
  line-height: 1;
  margin: 0;
  padding: 0;
}

.sale_banner p span{
  display: block;
  font-size:14px;
}
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