.btn-block Make a button a block-level button (i.e. make it span the full width of its parent).

.col-<size>-<n> Grid layout with <n> rows on device of particular size.

.container Responsive fixed-width container.

.container-fluid Full-width container, spanning the entire width of your viewport

<context> One of the following labels denoting context: 'default', 'muted' (text only), 'primary', 'success', 'info', 'warning', 'danger'.

.hidden-<size> Make the element hidden on devices of particular size.

.row A horizontal group of column cells.

<size> One of the following strings:
'xs' for extra small devices such as phones (<768px).
'sm' for small devices such as tablets (>=768px).
'md' for medium-size devices (>= 992px).
'lg' for large devices (>=1200px).

<style> One of the following strings:
'primary' provides extra visual weight and identifies the primary action in a set of buttons.
'success' indicates a successful or positive action.
'info' denotes useful information.
'warning' indicates caution should be taken with this action or situation.
'danger' indicates a dangerous or potentially negative action or situation.

.table-striped Makes every other row in the table shaded.

.visible-<size>-<n> Makes the element visible only on devices of particular size.

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