body {
	background: url("../images/bg.jpg") no-repeat center center fixed; 
	background-size: cover;
}

.overlay {
    display: flex;
	flex-wrap: wrap;
    justify-content: center;
    align-items: center;
	width: 40%;
    margin: 0 auto;
}

.langs {
	display: flex;
	width: 100%;
	justify-content: space-between;
    align-items: center;
}

.langs .en {
	margin-right: 10px;
}

.langs .ru {
	margin-left: 10px;
}

@media (max-width: 576px) {
	.overlay {
		width: 80%;
	}
}

@media (min-width: 576px) and (max-width: 768px) {
	.overlay {
		width: 70%;
	}
}

@media (min-width: 768px) and (max-width: 1200px) {
	.overlay {
		width: 50%;
	}
}

@media (min-width: 1921px) {
	.overlay {
		width: 30%;
	}
}