Please go to My Site → Customize → CSS (or Additional CSS), then add all of the following code to the bottom of that window.
/* This CSS customizes some colors that remained the default theme orange color.
* 10954444-hc (jw)
*/
button, input[type=button], input[type=reset], input[type=submit] {
background-color: #02c39a;
}
/* Makes subscription widget background transparent.
* 10954444-hc (jw)
*/
.widget.jetpack_subscription_widget {
background: transparent;
}
Tip: keep the /*
comment */
in the code to later know what this code does.