Hi @msdorsette,
You can use following code to change style of search and subscribe forms.
Please go to Appearance >> Customize >> Additional CSS and add following CSS there.
.jetpack_subscription_widget form input[type="submit"],
.jetpack_subscription_widget form input[type="email"],
.widget_search form input[type="submit"],
input[type="search"]{
font-family: Ubuntu;
}
input[type="submit"]:hover{
background: #ad7506;
border: 1px solid #ad7506;
color: #fff;
}
Hope it will help you.
Thank you.