How to change matrix table textbox width smaller?

I'm using a Matric Table Textbox and I want to bake the textbox smaller. How can I do this? I tried to locate the field ID but it's not listed there under properties.

Thanks

I found the answer to my own questions but I have an additional problem.

.form-matrix-values input[type="tel"] {
     width: 25px !important;
}

I have more than one numeric text box and I want to customize each one independent of the others. Can I do this?

No, you cannot customize text boxes independently in the matrix field under Survey Tools

However you might want to try any of these alternatives:

http://widgets.jotform.com/widget/matrix_dynamique

http://widgets.jotform.com/widget/configurable_list