Font Styling on Safari with El Capitan Update

Question

With the El Capitan update, I am having some design issues on my Safari websites.

Font somehow the seams are blurry. See the attached screenshot.

If you look carefully, you will see white fonts on the font.

Here is the code in my main.scss:

body {
background: $white;
font-family: "Lato", Lato, Helvetica, sans-serif;
font-weight: 300;
color: #333;
// font-style: normal;
// font-weight: normal;
// font-variant: normal;
// text-transform: none;
// line-height: 1;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;   }

Do you have an idea to solve this problem?

Thanks! Flo