Hi there,
I can see you have the following styles for the button that’s overwriting the default style :
.x-btn, .button, [type="submit"] {
background-color: hsl(197, 73%, 58%);
border-color: hsl(197, 68%, 36%);
border-radius: 0.25em;
box-shadow: 0 0.25em 0 0 hsl(197, 69%, 37%), 0 4px 9px rgba(0, 0, 0, 0.75);
color: #fff;
margin-bottom: 0.25em;
text-shadow: 0 0.075em 0.075em rgba(0, 0, 0, 0.5);
}
So check the customizer and change this.
Cheers!