body {
    background-image: url(../images/lab_c1.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: 0 0;
}

	@media screen and (max-width: 766px) {
		body {
		    background-position: 50% 50%;
		}
	}


	@media screen and (max-width: 766px) {
		.main_txt {
			padding-left: 10px;
			padding-right: 10px;
		}
		.main_txt br {
			display: none;
		}
	}