Form Inputs
Inputs, Textareas, and Selects (along with their labels and description boxes) will generally fill the width of their container by default, but with a maximum width of 600px. This 600px limit can be bypassed by including a .no-constrain class on the <form> tag. Use the .native-size class on an individual input (or a whole <form>) to override fluid sizing entirely and honor HTML-defined size attributes. This should be used with caution, since attributes like size and cols can override max-width constraints.