.SocialIcon.SocialIcon-EmailSignIn .Icon,
.SocialIcon.SocialIcon-EmailSignIn.HasText .Icon {
    /* https://commons.wikimedia.org/wiki/File:At_Sign_Nimbus.svg */
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    /*background-image: url('atsign.svg');*/
    background-size: 60%;
}

.SocialIcon.SocialIcon-EmailSignIn .Icon {
    background-position: 50%;
}

.SocialIcon.SocialIcon-EmailSignIn,
.SocialIcon.SocialIcon-EmailSignIn.HasText .Icon {
    /* Unfortunately, !important is used for .SocialIcon in style.css. */
    color: black !important;
    background-color: #ddd;
}

.SocialIcon.SocialIcon-EmailSignIn:hover {
    background-color: #bbb;
}