.ms-block-tabs.ms-block-theme-centered-nav .ms-tab-nav {
    background: #f2f2f2;
    text-align: center;
    padding: 5px 0;
}

.ms-block-tabs.ms-block-theme-centered-nav .ms-tab-nav .ms-tab-link {
    background: none;
}

.ms-block-tabs.ms-block-theme-centered-nav .ms-tab-nav .ms-tab-active .ms-tab-link {
    font-weight: 500;
}

.ms-block-tabs.ms-block-theme-centered-nav .ms-tab-element {
    border: none;
}