.back_top {
	position: fixed;
	bottom: 30px;
	margin-left: 10px;
}
.back_top a {
	width: 80px;
	display: block;
	text-align: center;
	font: 10px/100% Arial, Helvetica, sans-serif;
	text-transform: uppercase;
	text-decoration: none;
	color: #92e311;
    font-weight: bold;
	/* background color transition */
	-webkit-transition: 1s;
	-moz-transition: 1s;
	transition: 1s;
}
.back_top a:hover {
	color: #92e311;
	font-weight: bold;
}
/* arrow icon (span tag) */
.back_top span {
	width: 80px;
	height: 80px;
	display: block;
	border:  solid 3px #0a3310;
	margin-bottom: 7px;
	background: #68991a url(../Layout/f1.png) no-repeat center center;
	/* rounded corners */
	-webkit-border-radius: 15px;
	-moz-border-radius: 15px;
	border-radius: 15px;
	/* background color transition */
	-webkit-transition: 1s;
	-moz-transition: 1s;
	transition: 1s;
}
.back_top a:hover span {
    border: solid 3px #0a3310;
    background-color: #92e311;
}
@media screen and (max-width: 320px) {
    .back_top {
        visibility: hidden;
    }
}
@media screen and (min-width: 321px) and (max-width: 480px) {
    .back_top {
        visibility: hidden;
    }
}
@media screen and (min-width: 481px) and (max-width: 767px) {
    .back_top {
        visibility: hidden;
    }
}
@media screen and (min-width: 768px) and (max-width: 1023px) {
    .back_top {
        visibility: hidden;
    }
}
@media screen and (min-width: 1024px) and (max-width: 1200px) {
    .back_top {
        visibility: hidden;
    }

}