Customize Subscription form

style.css

/* Jetpack Subscriptions widget
------------------------------------------------------------ */

#header .jetpack_subscription_widget {
	-moz-box-shadow: 0 0 5px #999;
	-webkit-box-shadow: 0 0 5px #999;
	background-color: #b2c802;
	border: 4px solid #fff;
	border-radius: 10px;
	box-shadow: 0 0 5px #999;
	float: right;
	margin: 0;
	padding: 10px;
	width: 320px;
}

.jetpack_subscription_widget  {
	padding: 7px 14px 0 14px;
	width: 320px;
}

.jetpack_subscription_widget h4 {
    background: none repeat scroll 0 0 transparent;
    border-bottom: medium none;
    margin: 0;
    padding: 0;
}

.jetpack_subscription_widget h4 label {
	border: none;
	color: #fff;
	margin: 0;
	letter-spacing: 3px;
	padding: 4px 0 4px 0 !important;
	text-align: center;
	font-family: 'Open Sans Condensed';
	font-size: 22px;
	padding: 0 0 0 0 !important;
	text-transform: uppercase;
}

.jetpack_subscription_widget #subscribe-blog {
    padding: 0;
}

.jetpack_subscription_widget #subscribe-field {
	background-color: #fff;
	color: #4c4b4b;
	float: left;
	font-family: 'Sofia', 'Oswald', arial, serif;
	margin: 5px -7px 0 0;
	padding: 6px 5px !important;
	text-transform: lowercase;
	width: 265px !important;
}

.jetpack_subscription_widget input[type="submit"] {
    float: right;
    margin-top: 5px;
    padding-top: 15px;
    width: 40px;
}