Change header fonts to Helvetica

Hi There,

I’ve followed the instructions in this topic (https://kriesi.at/support/topic/changing-heading-font-to-helvetica/), however the fonts aren’t changing to Helvetica on my site. Here’s the code that I’ve added to the custom css:

h1, h2, h3, h4, h5, h6, #top .title_container .main-title, tr.pricing-row td, #top .portfolio-title, .callout .content-area, .avia-big-box .avia-innerbox, .av-special-font, .av-current-sort-title, .html_elegant-blog #top .minor-meta {

font-family: ‘HelveticaNeue’, ‘Helvetica Neue’, Helvetica, sans-serif !important;
font-weight: 200;

}

I’m looking to change all of the header and body font to Helvetica Neue with a slim font weight.