You need to give a class to subscribe box lets say class is “subscribe”, after that you need to apply following css:
.subscribe
{
background-color: #858585;
color:#FFF;
}
Thank you that was it. I have found and used the class from the subscribe box.
I did this
.email-subscription
{
background-color: #3b5998;
color:#FFF;
}
.mashsb-toggle-container
{
background-color: #3b5998;
color:#FFF;
}