/* Alinha as abas ao centro */
.tab-nav-center {
    text-align: center;
    display: block;
}

    .tab-nav-center > li {
        display: inline-block;
        float: inherit;
    }

.tab-nav-right {
    text-align: right;
    display: block;
}

    .tab-nav-right > li {
        display: inline-block;
        float: inherit;
    }

.nav-tabs-custom > .nav-tabs.tab-nav-center > li:first-of-type.active > a {
    border-left-color: #f4f4f4;
}

.nav-tabs-custom > .nav-tabs.tab-nav-right > li:first-of-type.active > a {
    border-left-color: #f4f4f4;
}