Infinite List Widget: How to increase Textbox size ?

I tried increasing widget size from the properties but it is not working! 
Is it any other way to increase the size of the textbox(I am usign 2 textbox per row) ?

In order to change Infinity List widget please add the pixels value inside the brackets {}:

You can see it here:

http://form.jotformpro.com/form/51334919780966? 

When filling in the form the width will adjust to the content:

Let us know if we can assist you further.   

Thanks. It works