Newsletter Signup Button Alignment

I've added a signup form on my posts and the button isnt aligning right on all browsers. Only works on safari. My code below and the form url:

http://www.jasonneuman.com/welcome-test/

[css]
/* Gravity Forms
------------------------------------------------------------ */

div.gform_wrapper input,
div.gform_wrapper select,
div.gform_wrapper textarea {
	-moz-box-shadow: 0 0 5px #bbb inset;
	-webkit-box-shadow: 0 0 5px #bbb inset;
	background-color: #fff;
	box-shadow: 0 0 5px #bbb inset;
	box-sizing: border-box !important;
	font-size: 14px !important;
	padding: 4px 5px !important;
}

body .gform_wrapper .gform_body .gform_fields .gfield input[type="text"] {
	height: 38px;
        margin-left: 55px;
}

body .gform_wrapper {
	background-color: #f5f5f5;
	padding: 10px;
}

div.gform_footer input.button {
	-moz-box-shadow: none;
	-webkit-box-shadow: none;
	box-shadow: none;
	color: #fff;
	padding: 8px 15px !important;
}

div.gform_wrapper .ginput_complex label {
	font-size: 14px;
}

div.gform_wrapper li,
div.gform_wrapper form li {
	margin: 0 0 10px;
}

div.gform_wrapper .gform_footer {
	border: none;
	margin: 0;
	padding: 0;
}

body #gform_wrapper_2 {
    position: relative;
}

body #gform_wrapper_2 div.validation_error {
	display:none
}

body #gform_wrapper_2 .gfield_error {
    width: 100%;
    border:none;
}

li#field_2_1 {
	padding-top:6px
}

li#field_2_1 input {
	width:66%;
}

body #gform_wrapper_2 .gform_footer {
    width: auto;
    position: absolute;
    top: 145px;
    left: 75%;
    padding: 0;
    margin: 0;
}

body #gform_wrapper_2 .gform_footer .gform_edit_link {
	display:none
}

Yes, 135px works well for chrome but doesn't display right in safari, firefox and ie?

Well, seems I can not win on mobile (iphone) it's really out of whack.