Form of Bootstrap global CSS style
. Form-control -- assign a separate form control to some global styles, such as the default width: 100%;
. Form-group -- wrap form control to get the best arrangement;
. Form-inline -- set the form to an inline form, only applicable when the viewport is at least PX width;
. Sr-only -- hide the label;
. Help-block -- used to set the prompt text;
. Form-horizontal -- horizontal layout of label and control group;
. Radio-inline and. checkbox-inline -- arrange the corresponding controls horizontally;
. Form-control-static -- set the p element to a static control;
. Has-error,. has-warning, and has-success correspond to the verification status respectively;
. Has-feedback -- add secondary icons to the control (used together with the icon reference class );
. Input-lg -- create larger form controls;
. Input-sm -- create smaller form controls;
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