Can’t change CSS

Hello everybody,
I’m using your amazing Metaslider and I need to change some css (caption wrap style). So I’ve tried to insert my change on my style.css file but nothing happens…
I’m using the DIVI theme from eleganthemes.com if can help you.

This is what I wrote on my css file:

.metaslider .caption-wrap {
background-color: rgba(255,255,255,0.35);
color: #fff;
}

.metaslider.ms-theme-simply-dark .rslides .caption-wrap .caption{
color: #000;
font-family: helvetica;
font-size: 2.2em;
padding: .7rem 1rem;
text-align: left;
}

Thanks

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