.oauth-button-yandex .oauth-mark,
.oauth-mark-yandex {
    background: #fc3f1d;
}

.oauth-button-mailru .oauth-mark,
.oauth-mark-mailru {
    background: #005ff9;
}

.oauth-button-google .oauth-mark,
.oauth-mark-google {
    color: #4285f4;
    background: #fff;
    border: 1px solid #dadce0;
    font-family: Arial, sans-serif;
}