How to align fields to center.

For some reason I am unable to center the form on the webpage. The form is placed into a Joomla article and situated inside a paragraph tag that is centered. It seems that the fields are not centered inside the form's own 900px width, and this is the problem. I have injected the following CSS with no results:

.form-all {
text-align: center;
}

What would you suggest?

Thanks!

You can inject this css to move the fields to the center.

#id_1,#id_3,#id_13,#id_4,#id_5,#id_10,#id_14,#id_11,#id_6, #id_17,#id_16,#id_12,#id_18{

padding-left:300px;

}

This selects some of the fields that are not aligned properly and adds a padding to align them to the center. You can also adjust the value of the highlighted number to fit your preference.