Добавить поле auto к left & right как margin: 16px auto
<figure class="wp-caption alignnone" style="box-sizing: inherit; margin: 16px auto; max-width: 100%; padding: 0.25rem; width: 200px;">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<title>Untitled 1</title>
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<body>
<aside id="media_image-3" class="widget widget_media_image" style="box-sizing: inherit; margin-bottom: 1rem; color: rgb(153, 153, 153); font-family: "Open Sans", Helvetica, Arial, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(249, 249, 249); text-decoration-style: initial; text-decoration-color: initial;">
<h3 class="widget-title" style="box-sizing: inherit; font-family: Dosis, sans-serif; font-style: normal; font-weight: 700; color: rgb(119, 119, 119); margin-top: 0px; margin-bottom: 0.375rem; font-size: 1.75rem; line-height: 1.2857; hyphens: none !important;">
We Support</h3>
<figure class="wp-caption alignnone" style="box-sizing: inherit; margin: 16px auto; max-width: 100%; padding: 0.25rem; width: 200px;">
<a href="http://www.healthstaffdiscounts.co.uk/" style="box-sizing: inherit; background-color: transparent; color: rgb(153, 153, 153); text-decoration: underline; outline: none; transition: all 0.5s ease 0s;">
<img alt="NHS Smart Card Discounts" class="image widget-footer-image" height="125" src="https://www.healthstaffdiscounts.co.uk/nhsdiscounts.jpg" style="box-sizing: inherit; border: 0px; max-width: 100%; height: auto; vertical-align: top; text-align: center;" width="200" /></a><figcaption class="wp-caption-text" style="box-sizing: inherit; font-family: "Open Sans", Helvetica, Arial, sans-serif; font-style: italic; font-weight: 400; font-size: 0.875rem; line-height: 1.5; color: rgb(119, 119, 119); text-align: center;">
NHS Smart Card Discounts</figcaption>
</figure>
</aside>
<aside id="media_image-6" class="widget widget_media_image" style="box-sizing: inherit; margin-bottom: 1rem; color: rgb(153, 153, 153); font-family: "Open Sans", Helvetica, Arial, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: center; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(249, 249, 249); text-decoration-style: initial; text-decoration-color: initial;">
<h3 class="widget-title" style="box-sizing: inherit; font-family: Dosis, sans-serif; font-style: normal; font-weight: 700; color: rgb(119, 119, 119); margin-top: 0px; margin-bottom: 0.375rem; font-size: 1.75rem; line-height: 1.2857; hyphens: none !important;">
We Develop For</h3>
<a href="https://www.bricsys.com/en-gb/" style="box-sizing: inherit; background-color: transparent; color: rgb(44, 125, 190); text-decoration: underline; outline: 0px; transition: all 0.5s ease 0s;">
<img alt="BricsCAD Trademark" class="image wp-image-287 attachment-medium size-medium" height="66" sizes="(max-width: 300px) 100vw, 300px" src="https://www.trucklesoft.co.uk/wp-content/uploads/2019/04/bricscad-trademark-300x66.png" srcset="https://www.trucklesoft.co.uk/wp-content/uploads/2019/04/bricscad-trademark-300x66.png 300w, https://www.trucklesoft.co.uk/wp-content/uploads/2019/04/bricscad-trademark.png 684w" style="box-sizing: inherit; border: 0px; max-width: 100%; height: auto; vertical-align: top;" width="300" /></a></aside>
</body>
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