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Basic Buttons
                                        
    <!--Default button-->
    <button class="btn btn-primary">Primary</button>

    <!--Icon button-->
    <button class="btn btn-primary btn-icon">
        <i class="fas fa-feather-alt">Primary</i>
        <span>Primary</span>
    </button>

    <!--Only icon button-->
    <button class="btn btn-primary btn-only-icon">
        <i class="fas fa-feather-alt">Primary</i>
    </button>
                                        
                                    
Invert Buttons
                                        
    <!--Default button-->
    <button class="btn btn-invert-brand">Brand</button>

    <!--Icon button-->
    <button class="btn btn-invert-brand btn-icon">
        <i class="fas fa-skull">Primary</i>
        <span>Brand</span>
    </button>

    <!--Only icon button-->
    <button class="btn btn-invert-brand btn-only-icon">
        <i class="fas fa-skull">Brand</i>
    </button>
                                        
                                    
Pill Style Buttons
Just adding .btn-pill you can get pill style button
                                        
    <button class="btn btn-success btn-pill">Pill Success</button>
                                        
                                    
Buttons Group
                                        
    <!--Default button group-->
    <div class="btn-group" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-primary">Left</button>
        <button type="button" class="btn btn-primary">Center</button>
        <button type="button" class="btn btn-primary">Right</button>
    </div>

    <!--Outline button group-->
    <div class="btn-group" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-outline-brand">Left</button>
        <button type="button" class="btn btn-outline-brand">Center</button>
        <button type="button" class="btn btn-outline-brand">Right</button>
    </div>

    <!--Invert button group-->
    <div class="btn-group" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-invert-info">Left</button>
        <button type="button" class="btn btn-invert-info">Center</button>
        <button type="button" class="btn btn-invert-info">Right</button>
    </div>
                                        
                                    
Button Icon Group
                                        
    <!--Default button icon group-->
    <div class="btn-group" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-primary btn-only-icon"><i class="fas fa-feather-alt"></i></button>
        <button type="button" class="btn btn-primary btn-only-icon"><i class="fas fa-microphone"></i></button>
        <button type="button" class="btn btn-primary btn-only-icon"><i class="fas fa-info-circle"></i></button>
    </div>

    <!--Outline button icon group-->
    <div class="btn-group" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-outline-brand btn-only-icon"><i class="fas fa-feather-alt"></i></button>
        <button type="button" class="btn btn-outline-brand btn-only-icon"><i class="fas fa-microphone"></i></button>
        <button type="button" class="btn btn-outline-brand btn-only-icon"><i class="fas fa-info-circle"></i></button>
    </div>

    <!--Invert button icon group-->
    <div class="btn-group" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-invert-info btn-only-icon"><i class="fas fa-feather-alt"></i></button>
        <button type="button" class="btn btn-invert-info btn-only-icon"><i class="fas fa-microphone"></i></button>
        <button type="button" class="btn btn-invert-info btn-only-icon"><i class="fas fa-info-circle"></i></button>
    </div>
                                        
                                    
Button Group Sizing
Just adding .btn-group-sm, .btn-group-lg you can get small and large button
                                        
    <!--Default button icon group-->
    <div class="btn-group btn-group-sm" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-primary btn-only-icon"><i class="fas fa-feather-alt"></i></button>
        <button type="button" class="btn btn-primary btn-only-icon"><i class="fas fa-microphone"></i></button>
        <button type="button" class="btn btn-primary btn-only-icon"><i class="fas fa-info-circle"></i></button>
    </div>

    <!--Invert button icon group-->
    <div class="btn-group btn-group-lg" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-invert-info btn-only-icon"><i class="fas fa-feather-alt"></i></button>
        <button type="button" class="btn btn-invert-info btn-only-icon"><i class="fas fa-microphone"></i></button>
        <button type="button" class="btn btn-invert-info btn-only-icon"><i class="fas fa-info-circle"></i></button>
    </div>
                                        
                                    
                                        
    <!--Default button group-->
    <div class="btn-group btn-group-sm" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-primary">Left</button>
        <button type="button" class="btn btn-primary">Center</button>
        <button type="button" class="btn btn-primary">Right</button>
    </div>

    <!--Invert button group-->
    <div class="btn-group btn-group-lg" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-invert-info">Left</button>
        <button type="button" class="btn btn-invert-info">Center</button>
        <button type="button" class="btn btn-invert-info">Right</button>
    </div>
                                        
                                    
Outline Buttons
                                        
    <!--Default button-->
    <button class="btn btn-outline-brand">Brand</button>

    <!--Icon button-->
    <button class="btn btn-outline-brand btn-icon">
        <i class="fas fa-award">Primary</i>
        <span>Brand</span>
    </button>

    <!--Only icon button-->
    <button class="btn btn-outline-brand btn-only-icon">
        <i class="fas fa-award">Brand</i>
    </button>
                                        
                                    
Air Style Buttons
Just adding .btn-air you can get air style button
                                        
    <button class="btn btn-brand btn-air">Air Brand</button>
                                        
                                    
Air + Pill Style Buttons
                                        
    <button class="btn btn-success btn-air btn-pill">Air Pill</button>
                                        
                                    
Buttons Group Styles
                                        
    <!--Air button group-->
    <div class="btn-group btn-group_air" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-primary">Left</button>
        <button type="button" class="btn btn-primary">Center</button>
        <button type="button" class="btn btn-primary">Right</button>
    </div>

    <!--Pill button group-->
    <div class="btn-group btn-group_pill" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-outline-brand">Left</button>
        <button type="button" class="btn btn-outline-brand">Center</button>
        <button type="button" class="btn btn-outline-brand">Right</button>
    </div>

    <!--Air + pill button group-->
    <div class="btn-group btn-group_air btn-group_pill" role="group" aria-label="Basic example">
        <button type="button" class="btn btn-invert-info">Left</button>
        <button type="button" class="btn btn-invert-info">Center</button>
        <button type="button" class="btn btn-invert-info">Right</button>
    </div>
                                        
                                    
Buttons Sizing
Just adding .btn-sm you can get small button
                                        
    <!--Default button-->
    <button class="btn btn-brand btn-sm">Brand</button>

    <!--Icon button-->
    <button class="btn btn-outline-brand btn-sm btn-icon">
        <i class="fas fa-award"></i>
        <span>Brand</span>
    </button>

    <!--Only icon button-->
    <button class="btn btn-invert-brand btn-sm btn-only-icon">
        <i class="fas fa-award">Brand</i>
    </button>
                                        
                                    
Just adding .btn-lg you can get small button
                                        
    <!--Default button-->
    <button class="btn btn-brand btn-lg">Danger</button>

    <!--Icon button-->
    <button class="btn btn-outline-brand btn-lg btn-icon">
        <i class="fas fa-award"></i>
        <span>Danger</span>
    </button>

    <!--Only icon button-->
    <button class="btn btn-invert-brand btn-lg btn-only-icon">
        <i class="fas fa-award">Brand</i>
    </button>
                                        
                                    
Button with Icon Group
                                        
    <div class="btn-icon-group">
        <button type="button" class="btn btn-danger">Logout</button>
        <button type="button" class="btn btn-only-icon"><i class="la la-power-off"></i></button>
    </div>
                                        
                                    
Pill style button
                                        
    <div class="btn-icon-group btn-icon-group_pill">
        <button type="button" class="btn btn-danger">Logout</button>
        <button type="button" class="btn btn-only-icon"><i class="la la-power-off"></i></button>
    </div>
                                        
                                    
Air style button
                                        
    <div class="btn-icon-group">
        <button type="button" class="btn btn-danger btn-air">Logout</button>
        <button type="button" class="btn btn-only-icon"><i class="la la-power-off"></i></button>
    </div>

    <div class="btn-icon-group btn-icon-group_pill">
        <button type="button" class="btn btn-danger btn-air">Logout</button>
        <button type="button" class="btn btn-only-icon"><i class="la la-power-off"></i></button>
    </div>