<div class="btn-group" role="group" aria-label="Basic example">
    <button type="button" class="btn btn-secondary">Left</button>
    <button type="button" class="btn btn-secondary">Middle</button>
    <button type="button" class="btn btn-secondary">Right</button>
</div>

<div class="btn-toolbar" role="toolbar" aria-label="Toolbar with button groups">
    <div class="btn-group mr-2" role="group" aria-label="First group">
        <button type="button" class="btn btn-secondary">1</button>
        <button type="button" class="btn btn-secondary">2</button>
        <button type="button" class="btn btn-secondary">3</button>
        <button type="button" class="btn btn-secondary">4</button>
    </div>
    <div class="btn-group mr-2" role="group" aria-label="Second group">
        <button type="button" class="btn btn-secondary">5</button>
        <button type="button" class="btn btn-secondary">6</button>
        <button type="button" class="btn btn-secondary">7</button>
    </div>
    <div class="btn-group" role="group" aria-label="Third group">
        <button type="button" class="btn btn-secondary">8</button>
    </div>
</div>

<div class="btn-toolbar mb-3" role="toolbar" aria-label="Toolbar with button groups">
    <div class="btn-group mr-2" role="group" aria-label="First group">
        <button type="button" class="btn btn-secondary">1</button>
        <button type="button" class="btn btn-secondary">2</button>
        <button type="button" class="btn btn-secondary">3</button>
        <button type="button" class="btn btn-secondary">4</button>
    </div>
    <div class="input-group">
        <span class="input-group-addon" id="btnGroupAddon">@</span>
        <input type="text" class="form-control" placeholder="Input group example"
               aria-label="Input group example" aria-describedby="btnGroupAddon">
    </div>
</div>

<div class="btn-toolbar justify-content-between" role="toolbar" aria-label="Toolbar with button groups">
    <div class="btn-group" role="group" aria-label="First group">
        <button type="button" class="btn btn-secondary">1</button>
        <button type="button" class="btn btn-secondary">2</button>
        <button type="button" class="btn btn-secondary">3</button>
        <button type="button" class="btn btn-secondary">4</button>
    </div>
    <div class="input-group">
        <span class="input-group-addon" id="btnGroupAddon2">@</span>
        <input type="text" class="form-control" placeholder="Input group example"
               aria-label="Input group example" aria-describedby="btnGroupAddon2">
    </div>
</div>

<div class="btn-group btn-group-lg" role="group" aria-label="Large button group">
    <button type="button" class="btn btn-secondary">Left</button>
    <button type="button" class="btn btn-secondary">Middle</button>
    <button type="button" class="btn btn-secondary">Right</button>
</div>
<br>
<div class="btn-group" role="group" aria-label="Default button group">
    <button type="button" class="btn btn-secondary">Left</button>
    <button type="button" class="btn btn-secondary">Middle</button>
    <button type="button" class="btn btn-secondary">Right</button>
</div>
<br>
<div class="btn-group btn-group-sm" role="group" aria-label="Small button group">
    <button type="button" class="btn btn-secondary">Left</button>
    <button type="button" class="btn btn-secondary">Middle</button>
    <button type="button" class="btn btn-secondary">Right</button>
</div>

<div class="btn-group" role="group" aria-label="Button group with nested dropdown">
    <button type="button" class="btn btn-secondary">1</button>
    <button type="button" class="btn btn-secondary">2</button>

    <div class="btn-group" role="group">
        <button id="btnGroupDrop1" type="button" class="btn btn-secondary dropdown-toggle"
                data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu" aria-labelledby="btnGroupDrop1">
            <a class="dropdown-item" href="#">Dropdown link</a>
            <a class="dropdown-item" href="#">Dropdown link</a>
        </div>
    </div>
</div>

<div class="btn-group-vertical" role="group" aria-label="Vertical button group">
    <button type="button" class="btn btn-secondary">Button</button>
    <button type="button" class="btn btn-secondary">Button</button>
    <button type="button" class="btn btn-secondary">Button</button>
    <button type="button" class="btn btn-secondary">Button</button>
    <button type="button" class="btn btn-secondary">Button</button>
    <button type="button" class="btn btn-secondary">Button</button>
</div>

<div class="btn-group-vertical" role="group" aria-label="Vertical button group">
    <button type="button" class="btn btn-secondary">Button</button>
    <button type="button" class="btn btn-secondary">Button</button>
    <div class="btn-group" role="group">
        <button id="btnGroupVerticalDrop1" type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu" aria-labelledby="btnGroupVerticalDrop1">
            <a class="dropdown-item" href="#">Dropdown link</a>
            <a class="dropdown-item" href="#">Dropdown link</a>
        </div>
    </div>
    <button type="button" class="btn btn-secondary">Button</button>
    <button type="button" class="btn btn-secondary">Button</button>
    <div class="btn-group" role="group">
        <button id="btnGroupVerticalDrop2" type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu" aria-labelledby="btnGroupVerticalDrop2">
            <a class="dropdown-item" href="#">Dropdown link</a>
            <a class="dropdown-item" href="#">Dropdown link</a>
        </div>
    </div>
    <div class="btn-group" role="group">
        <button id="btnGroupVerticalDrop3" type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu" aria-labelledby="btnGroupVerticalDrop3">
            <a class="dropdown-item" href="#">Dropdown link</a>
            <a class="dropdown-item" href="#">Dropdown link</a>
        </div>
    </div>
    <div class="btn-group" role="group">
        <button id="btnGroupVerticalDrop4" type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu" aria-labelledby="btnGroupVerticalDrop4">
            <a class="dropdown-item" href="#">Dropdown link</a>
            <a class="dropdown-item" href="#">Dropdown link</a>
        </div>
    </div>
</div>