This goes inside a directory titled 'css' inside your theme child directory = themename/css

simple-social.css

/* ## Simple Social Icons for FontAwesome Use
--------------------------------------------- */

.simple-social-icons {
	overflow: hidden;
}

.simple-social-icons ul {
	margin: 0;
	padding: 0;
}

.simple-social-icons ul li {
	background: none;
	border: none;
	float: left;
	list-style-type: none;
	margin: 2px;
	padding: 0;
}

.simple-social-icons ul li a {
	border: none ;
	-moz-box-sizing: content-box;
	-webkit-box-sizing: content-box;
	box-sizing: content-box;
	display: inline-block;
	font-style: normal;
	font-variant: normal;
	font-weight: normal;
	line-height: 1em;
	text-align: center;
	text-decoration: none;
	text-transform: none;
	width: 1em;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

.simple-social-icons ul {
    margin-left: -2px;
}

/* ----- alignright ----- */
.simple-social-icons ul.alignright {
    margin-right: -2px;
}

.simple-social-icons ul.alignright {
	float: right;
}

/* ----- aligncenter ----- */
.simple-social-icons ul.aligncenter {
	text-align: center;
}

.simple-social-icons ul.aligncenter li {
	display: inline-block;
	float: none;
}