.netmask {
	margin-left: auto;
	margin-right: auto;
	max-width: 30em;
}
.netmask__conv-form__row {
	display: flex;
}
.netmask__conv-form__row input,
.netmask__conv-form__row select {
	flex-grow: 1;
	margin: 0.0625em;
}