How do I make the submit button match the colour of the others

I have set the Submit button to match the same style as the others but for some reason it is showing white... I'm sure it will be a simple bit of CSS but I am struggling to get the exact colours to match.

Thank you

Please try adding the next CSS to the form:

.form-submit-button {
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#57a9eb), color-stop(100%,#3871c0)) !important;
background-image: linear-gradient(rgb(120, 195, 255) 0%, rgb(76, 133, 211) 100%);
text-shadow: 0 1px 0px #1e549d !important;
box-shadow: inset 0 1px 0 0 rgba(255, 255, 255, 0.30), 0 1px 2px 0 rgba(0, 0, 0, 0.40) !important;
}
.form-submit-button:hover {
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#57a9eb), color-stop(100%,#3871c0)) !important;
background-image: linear-gradient(rgb(120, 195, 255) 0%, rgb(76, 133, 211) 100%);
text-shadow: 0 1px 0px #1e549d !important;
box-shadow: inset 0 1px 0 0 rgba(255, 255, 255, 0.30), 0 1px 2px 0 rgba(0, 0, 0, 0.40) !important;
}