#### Horizontal

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

#### Input Group

@

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

#### Vertical

    <div class="btn-group-vertical" role="group" aria-label="Vertical button group">
        <button type="button" class="btn btn-dark">Button</button>
        <div class="btn-group" role="group">
          <button id="btnGroupVerticalDrop1" type="button" class="btn btn-dark dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown <svg> ... </svg>
          </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-dark">Button</button>
        <button type="button" class="btn btn-dark">Button</button>
        <div class="btn-group" role="group">
          <button id="btnGroupVerticalDrop2" type="button" class="btn btn-dark dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown <svg> ... </svg>
          </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>