.register-btn .icon.icon-mask {
    background-color: #00B7E2;
    mask-size: 20px 20px;
	-webkit-mask: url('/wp-content/themes/astra-child-master/images/external-link.svg') no-repeat center;
	mask: url('/wp-content/themes/astra-child-master/images/external-link.svg') no-repeat center;
	margin-left: 0;
}
.register-btn:hover .icon.icon-mask {
    background-color: #fff;
}