how to give a border to bootstrap tab contents

Question

I'm using bootstrap tabs and it works perfectly. I'm trying to figure out if there is a way to use bootstrap to give a border to the contents of the tabs that is connected to the border of the pill so it will look like one box. I tried doing this with my own css, but there is a cap between the tab pill border and tab content border that is a margin the tab pill needs to have and can't be removed. I want it to look like the below image.

Answer 1

The following css should do exactly what you're looking for :)

.tab-content {
    border-left: 1px solid #ddd;
    border-right: 1px solid #ddd;
    padding: 10px;
}

.nav-tabs {
    margin-bottom: 0;
}

margin-bottom: 0; on .nav-tabs removes the gap in between the pills and content.

The padding on .tab-content makes the content not pressed against the new borders on the left and right.

Answer 2

I would modify Kisuka's answer to the following:

CSS

.tab-pane {

    border-left: 1px solid #ddd;
    border-right: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
    border-radius: 0px 0px 5px 5px;
    padding: 10px;
}

.nav-tabs {
    margin-bottom: 0;
}

SCSS for Bootstrap 4

.tab-pane {
    border-left: 1px solid $nav-tabs-border-color;
    border-right: 1px solid $nav-tabs-border-color;
    border-bottom: 1px solid $nav-tabs-border-color;
    border-radius: 0px 0px $nav-tabs-border-radius $nav-tabs-border-radius;
    padding: $spacer;
}

.nav-tabs {
    margin-bottom: 0;
}

Answer 3

With following code, all corner have radius, but tabs offset.

.nav-tabs {
    padding-left: 15px;
    margin-bottom: 0;
    border: none;
}
.tab-content {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
}

Caution: If you set nav-tab's padding-left 0px, first tab conflicts with left-top radius of contents.

Answer 4

Being more DRY then @goat solution, you could also reuse the panel css like:

.tab-content.panel
{
    border-top: none; 
    border-top-left-radius: 0px; 
    border-top-right-radius: 0px;
}


<div>
    <ul class="nav nav-tabs">
        ...
    </ul>

    <div class="tab-content panel">
        <div class="tab-pane panel-body">
            ...
        </div>
    </div>
</div>

tab-content panel panel-default and tab-pane panel-body. Then you don't need to redefine the border and padding. Just remove the top border and top radius.