/* Login icon default color */
.WaGadgetLoginButton .loginContainer.loginContainer .loginLink {
background: #0066B8;
color: white;
}

/* Login icon hover color */
.WaGadgetLoginButton .loginContainer.loginContainer .loginLink:hover {
background: white;
color: #0066B8;
}

/* Logout icon default color */
.WaGadgetLoginButton .loginContainer.authenticated.loginContainer.authenticated .loginLink {
background: #0066B8;
color: white;
}

/* Logout icon hover color */
.WaGadgetLoginButton .loginContainer.authenticated.loginContainer.authenticated .loginLink:hover, .WaGadgetLoginButton .loginContainer.authenticated.loginContainer.authenticated .loginLink.hover {
background: white;
color: #0066B8;
}
     <link rel="shortcut icon" type="image/ico" href="/Resources/Pictures/BNHRC" />