Form Elements
Form controls
Textual form controls like <input>s, <select>s, and <textarea>s are styled with the .form-controlclass. Included are styles for general appearance, focus state, sizing, and more.
Sizing
Set heights using classes like .form-control-lgand .form-control-sm.
Readonly
Add the readonlyboolean attribute on an input to prevent modification of the input’s value. Read-only inputs appear lighter (just like disabled inputs), but retain the standard cursor.
Custom styled checkboxes and radios
Each checkbox and radio is wrapped in a <div>to create our custom control and a <label>for the accompanying text.
Default
Inline
Add class .checkbox--inlineor .radio--inlineto make the inputs inline
Disabled
Add attribute diasbledon the input elements where you need to make them disabled