It's very sorry that there is no option to change that color. Please use custom CSS, go Admin Panel > Appearance > Edit CSS (Jetpack Plugin installed required) to paste the custom codes of CSS.

Note: we now do not recommend JetPack anymore, please use your favorite plugin for custom CSS and JS, suggest "Simple Custom CSS and Js". .fw-team-inner {
   background: none;
} .fw-team-inner {
   background-color: rgba(7,109,146,0.7);

And just change the color code as you wish.