/* mobile */
input[type=submit] {
	width: 30vw;
}
form {
	margin-bottom: 20px;
}

@media screen and (min-width: 768px)    /* tablet   */
{
	input[type=submit] {
		width: 100px;
	}
}
@media screen and (min-width: 990px)    /* PC       */
{
}