Hey
In Wix Stores there are styles applied to the Additional Sections. You need to replace those styles in the html rendered by Wix Store.
What I did when a client needed this was to take the styles from the Wix Stores and modified them and stored that in variables like below. I have this on the Product Page Page Code.
// Styles
let tableStyle = '<table style="-webkit-border-horizontal-spacing:0px;-webkit-border-vertical-spacing:0px;border-bottom-color:rgb(128,128,128);border-collapse:collapse;border-left-color:rgb(128,128,128);border-right-color:rgb(128,128,128);border-top-color:rgb(128,128,128);box-sizing:border-box;color:rgb(47,46,46);display:table;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;height:100%;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:none;overflow-wrap:break-word;table-layout:fixed;text-align:left;white-space:normal;width:355px;word-break:break-word;word-wrap:break-word;">';
let tdStyle = '<td style="overflow:hidden;-webkit-border-horizontal-spacing:0px;-webkit-border-vertical-spacing:0px;border-bottom-color:rgb(160,160,159);border-bottom-style:solid;border-bottom-width:1px;border-collapse:collapse;border-left-color:rgb(160,160,159);border-left-style:solid;border-left-width:1px;border-right-color:rgb(160,160,159);border-right-style:solid;border-right-width:1px;border-top-color:rgb(160,160,159);border-top-style:solid;border-top-width:1px;box-sizing:border-box;color:rgb(47,46,46);display:table-cell;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;height:25px;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:none;overflow-wrap:break-word;padding-bottom:10px;padding-left:10px;padding-right:10px;padding-top:10px;text-align:left;vertical-align:middle;white-space:normal;width:118px;word-break:break-word;word-wrap:break-word;">';
let trStyle = '<tr style="-webkit-border-horizontal-spacing:0px;-webkit-border-vertical-spacing:0px;border-bottom-color:rgb(128,128,128);border-collapse:collapse;border-left-color:rgb(128,128,128);border-right-color:rgb(128,128,128);border-top-color:rgb(128,128,128);box-sizing:border-box;color:rgb(47,46,46);display:table-row;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;height:25px;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:none;overflow-wrap:break-word;text-align:left;vertical-align:middle;white-space:normal;width:354px;word-break:break-word;word-wrap:break-word;">';
let theadStyle = '<thead style="-webkit-border-horizontal-spacing:0px;-webkit-border-vertical-spacing:0px;border-bottom-color:rgb(128,128,128);border-collapse:collapse;border-left-color:rgb(128,128,128);border-right-color:rgb(128,128,128);border-top-color:rgb(128,128,128);box-sizing:border-box;color:rgb(47,46,46);display:table-header-group;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;height:25px;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:none;overflow-wrap:break-word;text-align:left;vertical-align:middle;white-space:normal;width:354px;word-break:break-word;word-wrap:break-word;">';
let thStyle = '<th style="-webkit-border-horizontal-spacing:0px;-webkit-border-vertical-spacing:0px;border-bottom-color:rgb(160,160,159);border-bottom-style:solid;border-bottom-width:1px;border-collapse:collapse;border-left-color:rgb(160,160,159);border-left-style:solid;border-left-width:1px;border-right-color:rgb(160,160,159);border-right-style:solid;border-right-width:1px;border-top-color:rgb(160,160,159);border-top-style:solid;border-top-width:1px;box-sizing:border-box;color:rgb(47,46,46);display:table-cell;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:bold;height:25px;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:none;overflow-wrap:break-word;padding-bottom:10px;padding-left:10px;padding-right:10px;padding-top:10px;text-align:left;vertical-align:middle;white-space:normal;width:118px;word-break:break-word;word-wrap:break-word;">';
let tbodyStyle = '<tbody style="-webkit-border-horizontal-spacing:0px;-webkit-border-vertical-spacing:0px;border-bottom-color:rgb(128,128,128);border-collapse:collapse;border-left-color:rgb(128,128,128);border-right-color:rgb(128,128,128);border-top-color:rgb(128,128,128);box-sizing:border-box;color:rgb(47,46,46);display:table-row-group;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;height:360px;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:none;overflow-wrap:break-word;text-align:left;vertical-align:middle;white-space:normal;width:354px;word-break:break-word;word-wrap:break-word;">';
let pStyle = '<p style="box-sizing:border-box;color:rgb(47,46,46);display:block;font-family:lato-light,lato,sans-serif;font-size:18px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;margin-bottom:0px;margin-left:0px;margin-right:0px;margin-top:0px;overflow-wrap:break-word;text-align:left;white-space:normal;width:100%;word-break:break-word;word-wrap:break-word;">';
let ulStyle = '<ul style="box-sizing:border-box;color:rgb(47,46,46);display:block;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;height:216px;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:circle;margin-bottom:0px;margin-left:0px;margin-right:0px;margin-top:0px;overflow-wrap:break-word;text-align:left;white-space:normal;width:355px;word-break:break-word;word-wrap:break-word;">';
let liStyle = '<li style="box-sizing:border-box;color:rgb(47,46,46);display:list-item;font-family:lato-light,lato,sans-serif;font-size:16px;font-stretch:normal;font-style:normal;font-variant-caps:normal;font-weight:normal;height:48px;line-height:24px;list-style-image:none;list-style-position:outside;list-style-type:circle;overflow-wrap:break-word;text-align:left;white-space:normal;width:315px;word-break:break-word;word-wrap:break-word;">';
Then when I render the sections as you also do I did the below trick to make it work. I have no idea if this is bad or not but it works.
let newDescription = element.description.replaceAll("<table>",tableStyle).replaceAll("<td>",tdStyle).replaceAll("<th>",thStyle).replaceAll("<tr>",trStyle).replaceAll("<thead>",theadStyle).replaceAll("<tbody>",tbodyStyle).replaceAll("<ul>",ulStyle).replaceAll("<li>",liStyle)
Then just
$w('#tecInfo').html = newDescription;
Hope it helps!