Hi there,
there is this CSS on your site adding box-shadows to the button element:
body.elementor-kit-14 button, body.elementor-kit-14 input[type="button"], body.elementor-kit-14 input[type="submit"], body.elementor-kit-14 .elementor-button {
font-family: "Fira Sans", fira sans;
box-shadow: 0px 0px 10px 0px rgba(0, 0, 0, 0.5);
}
Is this required as it is this CSS affecting the exit button.
If you need that CSS then add this CSS to override it on the exit button:
button.slideout-exit {
box-shadow: none !important;
}