Add this to the Theme > Customise CSS.

.elementor-widget-woocommerce-my-account .woocommerce .login .button, .elementor-widget-woocommerce-my-account .woocommerce .register .button, .elementor-widget-woocommerce-my-account .woocommerce .woocommerce-ResetPassword .button {

background: #FF0000;

border: none;

color: var(–forms-buttons-normal-text-color,#fff);

border-radius: var(–forms-buttons-border-radius,3px);

padding: var(–forms-buttons-padding,12px 32px);

}