Hello @kumpobiz,
Thanks for asking. 
You can add following CSS under X > Launch > Options > CSS to make necessary changes in classic tabs:
.x-nav-tabs {border: 2px solid #9c7373; border-bottom: 0;}
.x-nav-tabs.top>li a {border-bottom: 2px solid #9c7373; color: #754e4e; font-size: 18px;}
.x-nav-tabs.top>li {border-right: 2px solid #9c7373;}
.x-tab-content {border: 2px solid #9c7373; border-top: 0; font-size: 16px;}
.x-nav-tabs>li>a {background-color: #bd6e6e;}
.x-nav-tabs>li>a:hover {background-color: #b3a9a9; color: #252525;}
Please change color codes as per your requirement.
Thanks.