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Default buttons
Bootstrap state buttons

<button type="button" class="btn btn-primary">primary button</button>

<button type="button" class="btn btn-secondary">secondary button</button>

<button type="button" class="btn btn-success">Success</button>

<button type="button" class="btn btn-info">Info button</button>

<button type="button" class="btn btn-warning">warning button</button>

<button type="button" class="btn btn-danger">danger button</button>

<button type="button" class="btn btn-light">light button</button>
                                    
Large buttons
Add .btn-lg class for large size buttons

     <button type="button" class="btn btn-primary btn-lg">primary button</button>

     <button type="button" class="btn btn-secondary btn-lg">secondary button</button>

     <button type="button" class="btn btn-success btn-lg">Success button</button>

     <button type="button" class="btn btn-info btn-lg">Info button</button>

     <button type="button" class="btn btn-warning btn-lg">warning button</button>

     <button type="button" class="btn btn-danger btn-lg">danger button</button>

     <button type="button" class="btn btn-light btn-lg">light button</button>
                                    
Small buttons
Add .btn-sm class for small size buttons

     <button type="button" class="btn btn-primary btn-sm">primary button</button>

     <button type="button" class="btn btn-secondary btn-sm">secondary button</button>

     <button type="button" class="btn btn-success btn-sm">Success button</button>

     <button type="button" class="btn btn-info btn-sm">Info button</button>

     <button type="button" class="btn btn-warning btn-sm">warning button</button>

     <button type="button" class="btn btn-danger btn-sm">danger button</button>

     <button type="button" class="btn btn-danger btn-sm">danger button</button>

                                    
Extra Small buttons
Add .btn-xs class for extra small size buttons

     <button type="button" class="btn btn-primary btn-xs">primary button</button>

     <button type="button" class="btn btn-secondary btn-xs">secondary button</button>

     <button type="button" class="btn btn-success btn-xs">Success button</button>

     <button type="button" class="btn btn-info btn-xs">Info button</button>

     <button type="button" class="btn btn-warning btn-xs">warning button</button>

     <button type="button" class="btn btn-danger btn-xs">danger button</button>
                                    
Active Buttons
Add .active class for active state

     <button type="button" class="btn btn-primary active">active</button>

     <button type="button" class="btn btn-secondary active">active</button>

     <button type="button" class="btn btn-success active">active</button>

     <button type="button" class="btn btn-info active">active</button>

     <button type="button" class="btn btn-warning active">active</button>

     <button type="button" class="btn btn-danger active">active</button>
                                    
Disabled buttons
Add .disabled class or disabled="disabled" attribute for disabled button

     <button type="button" class="btn btn-primary disabled">disabled</button>

     <button type="button" class="btn btn-secondary disabled">disabled</button>

     <button type="button" class="btn btn-success disabled">disabled</button>

     <button type="button" class="btn btn-info disabled">disabled</button>

     <button type="button" class="btn btn-warning disabled">disabled</button>

     <button type="button" class="btn btn-danger disabled">disabled</button>
                                    
Custom state buttons
The .btn class used with <button>, <a> and <input> elements.
Link

     <a class="btn btn-primary" href="#" data-toggle="tooltip;" title="btn btn-primary" role="button">link</button>

     <input class="btn btn-primary" type="button" value="Input"  data-toggle="tooltip;" title="btn btn-secondary">

     <input class="btn btn-success" type="submit" value="Submit" data-toggle="tooltip" title="btn btn-success">

     <button class="btn btn-info" type="submit">Button</button>
                                    
outline buttons
Add .btn-outline-* class for border button

<button type="button" class="btn btn-outline-primary">Primary Button</button>
<button type="button" class="btn btn-outline-secondary">Secondary Button</button>
<button type="button" class="btn btn-outline-success">Success Button</button>
<button type="button" class="btn btn-outline-info">Info Button</button>
<button type="button" class="btn btn-outline-warning">Warning Button</button>
<button type="button" class="btn btn-outline-danger">Danger Button</button>
<button type="button" class="btn btn-outline-light txt-dark">Light Button</button>                                
bold Border outline buttons
Add .btn-outline-*-2x class for bold outline

<button type="button" class="btn btn-outline-primary">Primary Button</button>
<button type="button" class="btn btn-outline-secondary">Secondary Button</button>
<button type="button" class="btn btn-outline-success">Success Button</button>
<button type="button" class="btn btn-outline-info">Info Button</button>
<button type="button" class="btn btn-outline-warning">Warning Button</button>
<button type="button" class="btn btn-outline-danger">Danger Button</button>
<button type="button" class="btn btn-outline-light txt-dark">Light Button</button>
                                    
outline Large buttons
Add .btn-outline-* class for outline and .btn-lg class for large button

<button type="button" class="btn btn-outline-primary btn-lg">Primary Button</button>
<button type="button" class="btn btn-outline-secondary btn-lg">Secondary Button</button>
<button type="button" class="btn btn-outline-success btn-lg">Success Button</button>
<button type="button" class="btn btn-outline-info btn-lg">Info Button</button>
<button type="button" class="btn btn-outline-warning btn-lg">Warning Button</button>
<button type="button" class="btn btn-outline-danger btn-lg">Danger Button</button>
<button type="button" class="btn btn-outline-light btn-lg txt-dark">Light Button</button>
                                    
outline small buttons
Add .btn-outline-* class for outline and .btn-sm class for small button

<button type="button" class="btn btn-outline-primary btn-sm">Primary Button</button>
<button type="button" class="btn btn-outline-secondary btn-sm">Secondary Button</button>
<button type="button" class="btn btn-outline-success btn-sm">Success Button</button>
<button type="button" class="btn btn-outline-info btn-sm">Info Button</button>
<button type="button" class="btn btn-outline-warning btn-sm">Warning Button</button>
<button type="button" class="btn btn-outline-danger btn-sm">Danger Button</button>
<button type="button" class="btn btn-outline-light btn-sm txt-dark">Light Button</button>

                                    
Outline extra small buttons
Add .btn-outline-* class for outline and .btn-xs class for extra small button

<button type="button" class="btn btn-outline-primary btn-xs">Primary Button</button>
<button type="button" class="btn btn-outline-secondary btn-xs">Secondary Button</button>
<button type="button" class="btn btn-outline-success btn-xs">Success Button</button>
<button type="button" class="btn btn-outline-info btn-xs">Info Button</button>
<button type="button" class="btn btn-outline-warning btn-xs">Warning Button</button>
<button type="button" class="btn btn-outline-danger btn-xs">Danger Button</button>
<button type="button" class="btn btn-outline-light btn-xs txt-dark">Light Button</button>

                                    
Disabled outline buttons
Add .disabled class or disabled="disabled" attribute for disabled state

<button type="button" class="btn btn-outline-primary disabled">disabled</button>
<button type="button" class="btn btn-outline-secondary disabled">disabled</button>
<button type="button" class="btn btn-outline-success disabled">disabled</button>
<button type="button" class="btn btn-outline-info disabled">disabled</button>
<button type="button" class="btn btn-outline-warning disabled">disabled</button>
<button type="button" class="btn btn-outline-danger disabled">disabled</button>
<button type="button" class="btn btn-outline-light disabled txt-dark">disabled</button>

                                    
Gradien buttons
Add .btn-*-gradien class for gradien button

<button type="button" class="btn btn-primary-gradien"> Primary Button</button>
<button type="button" class="btn btn-secondary-gradien"> Secondary Button</button>
<button type="button" class="btn btn-success-gradien"> Success Button</button>
<button type="button" class="btn btn-info-gradien"> Info Button</button>
<button type="button" class="btn btn-warning-gradien"> Warning Button</button>
<button type="button" class="btn btn-danger-gradien"> Danger Button</button>