Use .btn-large for Large buttons :

Default Primary Danger Warning Success Info Inverse

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Use .btn-small for Small buttons :

Default Primary Danger Warning Success Info Inverse

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Use .btn-mini for Mini buttons :

Default Primary Danger Warning Info Success Inverse

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Use .btn-group for group buttons :

Left Middle Right

Examples to use buttons :

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Use color buttons :

.btn-primary .btn-inverse .btn-success .btn-warning .btn-info .btn-danger

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Toolbar icon example :

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Buttons with both text and icon :

Delete Close Settings Upload Shutting down Add item

Drop-down menu. Use .dropdown-toggle

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Split button dropdowns

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Drop-up menu