That order form has poor usability. 1. It uses placeholder text instead of a label. See "Placeholders in Form Fields Are Harmful" https://www.nngroup.com/arti

That order form has poor usability. 1. It uses placeholder text instead of a label. See "Placeholders in Form Fields Are Harmful" https://www.nngroup.com/articles/form-design-placeholders/ https://www.nngroup.com/articles/form-design-placeholders/ 2. It hides the fact that the "$250/year" is actually a text box. See "Long-Term Exposure to Flat Design: How the Trend Slowly Decreases User Efficiency" https://www.nngroup.com/articles/flat-design-long-exposure/ https://www.nngroup.com/articles/flat-design-long-exposure/ 3. The app makes the text box into a button plus text box. As a button, it modifies its parent widget, the radio button. This is unexpected behavior. The app would be better to show the text box after the user selects the "Founding Member" radio button. That would make the text box subordinate to the radio button and reduce user errors. See "8 Design Guidelines for Complex Applications - 6. Reduce Clutter Without Reducing Capability" https://www.nngroup.com/articles/complex-application-design/ https://www.nngroup.com/articles/complex-application-design/