[CLOSED] How to change default font family

[trePjt]

I have create a .css file and load this file in every form in my web site.

.label-view .x-panel-body .x-form-display-field .x-form-field .x-body
{
    background: white;
    font: 12px "Helvetica Neue",Arial, Helvetica, sans-serif;
}

body, div, form, img, ul, ol, li, dl, dt, dd, table, td, tr, th
{
    font: normal 12px "Helvetica Neue",tahoma,arial,helvetica,sans-serif;
}

However, it seems that the labelfield of most control, like textfield, combobox, datefield etc. have not change.

How can I get it works for all control?