html,
body {
	margin: 0;
	padding: 0;
  overflow-x: hidden;
}

.imm {
	width: 20vw;
	height: calc(20vw * 302.0 / 427.0);

}

@media screen and (max-width:640px) { 
	.imm {
		width: 28vw;
		height: calc(28vw * 302.0 / 427.0);
	
	}
}