Form fields all have a default max-width of 415px, but there are cases when a form field needs to increase or decrease in size. You can apply a CSS class to the HTML input, or its parent element, to declare a field width size other than the default.
Input Field Widths
There are six additional field widths that may be used, with the default set to 415px. A CSS class should be applied to the HTML input, or its parent element to declare a field width size other than the default.