body {

}
@font-face
{
    font-family: 'Montserrat-Regular';
    src: url('Montserrat-Regular.ttf'); /* here you go, IE */
}
@font-face
{
    font-family: 'Montserrat-SemiBold';
    src: url('Montserrat-SemiBold.ttf'); /* here you go, IE */
}
@font-face
{
    font-family: 'Montserrat-Bold';
    src: url('Montserrat-Bold.ttf'); /* here you go, IE */
}