body {
	min-width: 320px;
	height: 100%;

	margin: 0;
	padding: 0;

	background-color: grey;
	box-sizing: border-box;
}

.container {
	max-width: 720px;
}
.main-block img{
    width: 100%;
    height: 100%;
}

.desktop {
    display: none;
}

@media (min-width: 768px) {
    .container {
		max-width: 100%;
    }
    .adaptive {
        display: none;
    }
    .desktop {
        display: block;
    }
}