<container name="chennai.review" htmlTag="div" htmlClass="review" before="footer-container">
<block class="GworksAboutBlockReview" name="chennai.review.info" template="Gworks_About::review.phtml"/>
</container>

<referenceContainer name="page.bottom.container">
    <container name="chennai.review" htmlTag="div" htmlClass="review">
        <block class="GworksAboutBlockReview" name="chennai.review.info" template="Gworks_About::review.phtml"/>
    </container>
</referenceContainer>

<your Magento install dir>php bin/magento setup:static-content:deploy
<your Magento install dir>php bin/magento indexer:reindex
<your Magento install dir>php bin/magento cache:flush