Divi Includes a Social Media Follow Module which lets you display social media icons linking to your social media accounts. Here are a couple of ways to change the background color of your social media follow module icons.

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Change the Background on a Single Icon

To set the background on individual social media icons, go into the Social Media Follow Settings and then click on the settings icon next to the icon you want to style, e.g.:

​Then in that icon's Social Network Settings, set the background color at:
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​Social Network Settings > Content > Background > Background

You should now see the background color set on your icon.

Change the Background on all Icons at Once,

You can use the Social Media Follow Module's custom CSS option to set the background on all icons at once. Go to:
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​Social Media Follow Settings > Advanced > Custom CSS > Social Icon
​
​And set the background with some CSS such as:
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​background-color: #000 !important;
​
​E.g.

​You should now see the background color set on your icon.