Hi,
Give a try with this css. It can exactly be like your screenshot because of the existing structure, and would require additional customization that is outside the scope of our support.
.page-id-14352 .tab-content{
border: 1px solid;
border-color: #ccc;
margin-top: -19px;
padding: 10px;
}
.spb_tabs .nav-tabs li:first-child a, .spb_tabs .nav-tabs li:last-child a {
border-color: #ccc!important;
-moz-border-radius-topleft: 0px!important;
-moz-border-radius-bottomleft: 0px!important;
-webkit-border-top-left-radius: 0px!important;
-webkit-border-bottom-left-radius: 0px!important;
border-top-left-radius: 0px!important;
border-bottom-left-radius: 0px!important;
}
-Rui