@The_blue There isn't direct way to do this type of formatting in flow, you can use below expression to format specific column, but you need to also the value in the expression. Use this expression after Create HTML action by adding compose action.
replace(body('Create_HTML_table'),'<td>Blue','<td class="tdcolor">Blue')
Then add another compose action and provide following that compose action. Here are you are defining the styling, like the background color
<style>
.tdcolor{
background-color: red;
}
</style>
Now use outputs of those compose actions in the send email action, first use Output of Styling compose action and then output of HTML compose action.
