pre-links icons

/* icons for links */
[href*=".pdf"]:before {
    display: inline-block;
    margin-right: 3px;
    vertical-align: -20%;
    content: url(data:image/png;base64,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);
}

[href*="wikipedia.org"]:before {
    display: inline-block;
    margin-right: 3px;
    vertical-align: -20%;
    content: url(data:image/png;base64,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);
}

[href*="mailto"]:before {
    display: inline-block;
    margin-right: 3px;
    vertical-align: -20%;
    content: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAMCAYAAABr5z2BAAAABmJLR0QA/wD/AP+gvaeTAAAAx0lEQVQokaXRsWoCQRCH8Z+gwcImtZDXSKFdziLpUiUSIhFBsBH0UfIM6bQP5K1MjFjlUjgHx2Ulh06zDDvfx392G8idUc0495jgvSZ3jRU6IsEIWwxrwDf4wjJYOa5wi+9/JAU8RrcqgLuQPCbgLOCX6JOCQrLFfQIui7vIm/7WJX7whifssHZ46HZqr3KCKT7RxwM2kWaMXtzNjq3wHMNZSd7CRanvh2RaFcwDHqQiViqL2TnyRgj2WOCjhoDDd76iXQhOrl9HlTXdR5pu3gAAAABJRU5ErkJggg==)
}