Overview

Metronic customizes the Bootstrap Tabs through the SASS variables in src/sass/_variables.scssand adds additonal options in src/sass/_nav.scss.

Line Tabs

To use a custom Line Tabs style just add .nav-line-tabsclass as shown below:

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<ul class="nav nav-tabs nav-line-tabs mb-5 fs-6">
    <li class="nav-item">
        <a class="nav-link active" data-bs-toggle="tab" href="#kt_tab_pane_1">Link 1</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" data-bs-toggle="tab" href="#kt_tab_pane_2">Link 2</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" data-bs-toggle="tab" href="#kt_tab_pane_3">Link 3</a>
    </li>
</ul>

Line Tabs 2x

Add .nav-line-tabs-2xclass to us a line tab with 2px border width:

<ul class="nav nav-tabs nav-line-tabs nav-line-tabs-2x mb-5 fs-6">
    <li class="nav-item">
        <a class="nav-link active" data-bs-toggle="tab" href="#kt_tab_pane_4">Link 1</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" data-bs-toggle="tab" href="#kt_tab_pane_5">Link 2</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" data-bs-toggle="tab" href="#kt_tab_pane_6">Link 3</a>
    </li>
</ul>

Card Tabs

Add .nav-stretchclass to use line tabs in card header:

Title

<div class="card ">
    <div class="card-header card-header-stretch">
        <h3 class="card-title">Title</h3>
        <div class="card-toolbar">
            <ul class="nav nav-tabs nav-line-tabs nav-stretch fs-6 border-0">
                <li class="nav-item">
                    <a class="nav-link active" data-bs-toggle="tab" href="#kt_tab_pane_7">Link 1</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" data-bs-toggle="tab" href="#kt_tab_pane_8">Link 2</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" data-bs-toggle="tab" href="#kt_tab_pane_9">Link 3</a>
                </li>
            </ul>
        </div>
    </div>
    <div class="card-body">
        <div class="tab-content" id="myTabContent">
            <div class="tab-pane fade show active" id="kt_tab_pane_7" role="tabpanel">
                ....
            </div>

            <div class="tab-pane fade" id="kt_tab_pane_8" role="tabpanel">
                ...
            </div>

            <div class="tab-pane fade" id="kt_tab_pane_9" role="tabpanel">
                ...
            </div>
        </div>
    </div>
</div>