.btn-google {
    color: #fff;
    background-color: #dd4b39;
    border-color: #dd4b39;
}

.btn-facebook {
    color: #ffffff;
    background-color: #4267B2;
    border-color: #4267B2;
}

.btn-microsoft {
    color: #ffffff;
    background-color: #0067B8;
    border-color: #0067B8;
}

.btn-yahoo {
    color: #ffffff;
    background-color: #6001D2;
    border-color: #6001D2;
}

.btn-twitter {
    color: #24292C;
    background-color: #E3E3E3;
    border-color: #E3E3E3;
}

    .btn-twitter i {
        color: #1AB7EA;
    }