here you can put your own css to customize and override the theme 

 -------------------------------------------
    Tab
---------------------------------------------- 
.tab-content {
    background-color: #fff;
}

.nav-tabs {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    border-bottom: 1px solid #eee;
    color: #333;
}

    .nav-tabs .nav-item.show .nav-link,
    .nav-tabs .nav-item .nav-link.active,
    .nav-tabs .nav-item:hover .nav-link {
        color: #336699;
    }

.nav-link {
    display: block;
    position: relative;
    font-size: 1.4rem;
    font-weight: 600;
    color: inherit;
    line-height: 1;
    letter-spacing: 0;
    text-align: center;
    text-transform: uppercase;
    border-radius: 0;
    border: 0;
    padding: 1.5rem 2.85rem;
    -webkit-transition: border 0.3s, color 0.3s, background-color 0.3s;
    transition: border 0.3s, color 0.3s, background-color 0.3s;
}

.nav-item:not(:last-child) {
    margin-right: 3rem;
}

.nav-fill .nav-item {
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
}

.tab-content {
    position: relative;
}

    .tab-content > .tab-pane {
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
        bottom: 0;
        height: 0;
        opacity: 0;
        z-index: -1;
        -webkit-transition: visibility 0.3s, opacity 0.3s;
        transition: visibility 0.3s, opacity 0.3s;
        overflow: hidden;
        visibility: hidden;
    }

    .tab-content > .active {
        visibility: visible;
        opacity: 1;
        height: auto;
        position: relative;
        z-index: auto;
    }

.tab-pane {
    font-size: 1.3rem;
    line-height: 1.7;
    padding: 1.3rem 0;
    color: #666;
}

    .tab-pane p {
        margin-bottom: 0;
        font-size: inherit;
        letter-spacing: 0;
        line-height: 2;
    }

.tab-nav-boxed .nav-item:not(:last-child) {
    margin-right: 0rem;
}

.nav-tabs > li > a {
    margin-right: 0px;
    line-height: 1.42857143;
    border: 1px solid transparent;
    border-radius: 4px 4px 0 0;
}

.tab-nav-solid .nav-tabs {
    border-bottom: 0;
}

.tab-nav-solid .nav-item.show .nav-link,
.tab-nav-solid .nav-item .nav-link.active,
.tab-nav-solid .nav-item:hover .nav-link {
    color: #fff;
    background-color: #8ab21f;
    border-color: #8ab21f;
}



.nav-link-custom.active {
    border: none;
    border-bottom: 2px solid #8ab21f;
    color: #8ab21f !important;
    background-color: #fff !important;
    text-align: left;
    padding-left: 0px;
}




.tab-nav-solid .nav-link {
    border-color: #9e9e9e;
    margin-bottom: 0.5rem;
}

.tab-nav-solid .tab-pane {
    padding: 0.8rem 0 1.4rem;
}

.tab-nav-solid2 .nav-item.show .nav-link,
.tab-nav-solid2 .nav-item .nav-link.active,
.tab-nav-solid2 .nav-item:hover .nav-link {
    color: #336699;
    background-color: #f5f5f5;
    border-color: #f5f5f5;
}

.tab-nav-solid2 .nav-item:not(:last-child) {
    margin-right: 2rem;
}

.tab-nav-solid2 .nav-link {
    color: #333;
}

.tab-nav-solid2 .tab-content {
    border: 1px solid #eee;
}

.tab-boxed .nav-tabs {
    border-bottom: 0;
}

.tab-boxed .nav-link {
    padding: 1.45rem 2.95rem 1.55rem;
    margin-bottom: -0.1rem;
    z-index: 1;
}

.tab-boxed .tab-pane {
    padding: 1.3rem 2rem 0;
}

    .tab-boxed .tab-pane.active p {
        margin-bottom: 1.3rem;
    }

.tab-nav-outline .nav-tabs {
    border-bottom: 0;
}

.tab-nav-outline .nav-item.show .nav-link,
.tab-nav-outline .nav-item .nav-link.active,
.tab-nav-outline .nav-item:hover .nav-link {
    border: 2px solid #336699;
    border-radius: 0.3rem;
}

.tab-nav-outline .nav-link {
    color: #333;
    border: 2px solid transparent;
    padding: 1.3rem 2.85rem;
}

.tab-nav-outline2 .nav {
    position: relative;
    z-index: 1;
}

.tab-nav-outline2 .nav-item.show .nav-link,
.tab-nav-outline2 .nav-item .nav-link.active,
.tab-nav-outline2 .nav-item:hover .nav-link {
    border: 1px solid #eee;
    border-bottom-color: #fff;
}

.tab-nav-outline2 .tab-content {
    border: 1px solid #eee;
}

.tab-nav-outline2 .nav-item:not(:last-child) {
    margin-right: 0.7rem;
}

.tab-nav-outline2 .nav-link {
    border: 1px solid transparent;
    padding: 1.4rem 2.85rem;
    margin-bottom: -1px;
}

.tab-nav-outline3 .nav-tabs {
    border-bottom: 0;
}

.tab-nav-outline3 .nav-item .nav-link::before {
    content: "";
    display: block;
    position: absolute;
    left: 0;
    width: 3px;
    height: 100%;
    top: 50%;
    -webkit-transform: translateY(-50%) scale(0);
    transform: translateY(-50%) scale(0);
    background-color: transparent;
    -webkit-transition: -webkit-transform 0.3s;
    transition: -webkit-transform 0.3s;
    transition: transform 0.3s;
    transition: transform 0.3s, -webkit-transform 0.3s;
    z-index: 1;
}

.tab-nav-outline3 .nav-item.show .nav-link::before,
.tab-nav-outline3 .nav-item .nav-link.active::before,
.tab-nav-outline3 .nav-item:hover .nav-link::before {
    background-color: #336699;
    -webkit-transform: translateY(-50%) scale(1);
    transform: translateY(-50%) scale(1);
}

.tab-nav-outline3 .nav-link {
    color: #333;
    border: 1px solid #eee;
    padding: 1.4rem 0 1.4rem 2rem;
}

.tab-nav-underline .nav-item:not(:last-child) {
    margin-right: 3rem;
}

.tab-nav-underline .nav-link {
    padding: 1.4rem 0;
}

    .tab-nav-underline .nav-link::after {
        content: "";
        display: block;
        position: absolute;
        bottom: -1px;
        left: 0;
        width: 100%;
        border-top: 3px solid transparent;
        -webkit-transform: scaleX(0);
        transform: scaleX(0);
        -webkit-transition: border-color 0.3s, -webkit-transform 0.3s;
        transition: border-color 0.3s, -webkit-transform 0.3s;
        transition: transform 0.3s, border-color 0.3s;
        transition: transform 0.3s, border-color 0.3s, -webkit-transform 0.3s;
    }

.tab-nav-underline .nav-item.show .nav-link::after,
.tab-nav-underline .nav-item .nav-link.active::after,
.tab-nav-underline .nav-item:hover .nav-link::after {
    border-color: #336699;
    -webkit-transform: scaleX(1);
    transform: scaleX(1);
}

.tab-nav-underline.type2 .nav-item {
    margin-right: 0;
}

.tab-nav-underline.type2 .nav-link {
    padding: 1.4rem 1.5rem;
}

.tab-nav-center .nav {
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
}

    .tab-nav-center .nav .nav-item {
        margin: 0 1.5rem;
    }

.tab-nav-center.tab-nav-outline2 .nav-item {
    margin: 0 0.5rem;
}

.tab-vertical {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
}

    .tab-vertical .nav {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-direction: column;
        flex-direction: column;
        -ms-flex-wrap: nowrap;
        flex-wrap: nowrap;
        width: 26.3%;
    }

    .tab-vertical .nav-item {
        margin-right: 0;
    }

    .tab-vertical .nav-link {
        position: relative;
        padding-left: 2.2rem;
        padding-right: 2rem;
        text-align: left;
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .tab-vertical .tab-content {
        width: 73.7%;
        border-top: 1px solid #eee;
        padding-left: 2rem;
    }

    .tab-vertical .tab-pane {
        padding-top: 1.3rem;
    }

    .tab-vertical.tab-nav-outline3 .nav {
        width: 27%;
    }

    .tab-vertical.tab-nav-outline3 .nav-link {
        padding-left: 2.1rem;
    }

    .tab-vertical.tab-nav-outline3 .tab-content {
        padding-left: 1.7rem;
    }

.tab-line-grow .tab-pane {
    padding: 1.7rem 0;
}

.nav-filters {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
    color: #666;
    line-height: 1;
}

    .nav-filters li:not(:last-child) {
        margin-right: 1rem;
    }

.nav-filter {
    display: inline-block;
    position: relative;
    padding: 0.6rem 0 0.7rem;
    color: inherit;
    -webkit-transition: color 0.4s;
    transition: color 0.4s;
}

    .nav-filter.active, .nav-filter:hover {
        color: #336699;
    }

    .nav-filter span {
        color: #aaa;
        margin-left: 0.6rem;
    }

.filter-underline .nav-filter::after {
    content: "";
    display: block;
    height: 2px;
    border: 1px solid;
    -webkit-transform: scale(0);
    transform: scale(0);
    -webkit-transition: -webkit-transform 0.4s;
    transition: -webkit-transform 0.4s;
    transition: transform 0.4s;
    transition: transform 0.4s, -webkit-transform 0.4s;
}

.filter-underline .nav-filter.active::after, .filter-underline .nav-filter:hover::after {
    -webkit-transform: scale(1);
    transform: scale(1);
}

.filter-boxed li {
    margin-bottom: 0.5rem;
}

.filter-boxed .nav-filter {
    padding: 1.1rem 1.9rem;
    border: 1px solid #ccc;
    border-radius: 0.3rem;
    text-transform: uppercase;
    font-size: 1.3rem;
    font-weight: 600;
    color: #333;
    -webkit-transition: color 0.3s, border-color 0.3s;
    transition: color 0.3s, border-color 0.3s;
}

    .filter-boxed .nav-filter.active, .filter-boxed .nav-filter:hover {
        color: #336699;
        border-color: #336699;
    }


.nav-tabs > li {
    float: left;
    margin-bottom: -1px;
    flex-grow: 1 !important;
}

@media (max-width: 991px) {
    .filter-boxed {
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
    }

        .filter-boxed li {
            margin: 0 0.5rem 0.5rem !important;
        }
}

@media (max-width: 767px) {
    .tab-vertical {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -ms-flex-flow: column nowrap;
        flex-flow: column nowrap;
    }

        .tab-vertical .tab-content,
        .tab-vertical .nav-tabs, .tab-vertical.tab-nav-outline3 .nav {
            width: 100%;
        }

    .tab-line-grow .tab-content {
        padding-right: 1rem;
        padding-left: 1rem;
    }
}

@media (max-width: 575px) {
    .tab-nav-outline2 .nav-link {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

.link-section {
    margin-bottom: 2.8rem;
}

    .link-section .title {
        margin-bottom: 0.9rem;
    }

.side-tab-section {
    margin-bottom: 1.1rem;
}



.mt-2 {
    margin-top: 2rem !important;
}

.mb-2 {
    margin-bottom: 2px !important;
}

.mt-3 {
    margin-top: 3rem !important;
}

.mb-3 {
    margin-bottom: 3px !important;
}


.mt-4 {
    margin-top: 4rem !important;
}

.mb-4 {
    margin-bottom: 4px !important;
}

.mt-5 {
    margin-top: 5rem !important;
}

.mb-5 {   
    margin-bottom: 5px !important;
}

.col-md-no-padding {
 /*   padding-right: 0px !important;
    padding-left: 0px !important;*/
}


.table-colum-mapping-source > thead > tr > td {
    padding: 8px 0px 8px 0px !important;
    line-height: 1.42857143;
    vertical-align: top;
}

.table-colum-mapping-source thead tr th {
    font-weight: 700;
    padding: 8px 0px 8px 0px !important;
}


.table-colum-mapping > thead > tr > th {
    padding: 8px 0px 8px 0px !important;
    line-height: 1.42857143;
    vertical-align: top;
    font-weight:700;
}


.table-colum-mapping > tbody > tr > td {
    padding: 8px 0px 8px 0px !important;
    line-height: 1.42857143;
    vertical-align: top;
    border-top: 1px solid #ddd;
}





.form-control-table {
    border: 2px solid #ddd;
}

.invalid-item{
    opacity:0.9;
}



.dt-label {
    color: #8ab21f;
    font-weight: 700;
    font-size: 14px;
    margin-bottom: 20px;
}