@font-face {
    font-family: Test_Font;
    src: url('/s/sfsites/c/resource/Test_Font') format('woff');
}

form, 
form select, 
form input, 
form tr,
form th,
form td,
form a,
form .sfdcBody.mainTitle.btn.dateFormat.dataCol.requiredInput,
body .x-btn button, body .btn, body .btnImportant, body .btnDisabled, body .btnCancel, body .menuButton .menuButtonButton, body .menuButton .menuButtonMenu a, body .menuButton .menuButtonMenu input.theOption, h1, h2, h3, h4, h5, h6
{
    font-family: Test_Font ;
}