main {
	position: fixed;
	width: 100%;
	height: 100%;
	top: 0;
	left: 0;
}
#lgm {
    opacity: 0.4;
}
#lgm img {
	width: 120px;
	height: auto;
}

@media only screen and (max-width: 640px){
	#lgm img {
		width: 20vw;
	}
}

footer {
	position: absolute;
	z-index: 0;
	width: 100%;
	left: 0;
	bottom: 0;
    text-align: center;
    padding: 4.0em 0;
}
	footer #lgmBisen {
		text-align: center;
        margin-bottom: 1.0em;
	}
	footer #lgmBisen img {
		width: auto;
	    height: 1.8em;
	}
    footer small {
	    display: block;
	    font-size: 0.5em;
	    letter-spacing: 0.05em;
	    opacity: 0.4;
	}
@media only screen and (max-width: 640px){
	footer #lgmBisen img {
		width: 34vw;
		height: auto;
	}
    footer small {
        font-size: 1.6vw;
    }
}