body{
/* color */
background: rgb(45,46,131);
background: -moz-linear-gradient(45deg, rgba(45,46,131,1) 0%, rgba(54,169,225,1) 100%);
background: -webkit-linear-gradient(45deg, rgba(45,46,131,1) 0%, rgba(54,169,225,1) 100%);
background: linear-gradient(45deg, rgba(45,46,131,1) 0%, rgba(54,169,225,1) 100%);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#2d2e83",endColorstr="#36a9e1",GradientType=1);

/* position */
background-repeat: no-repeat;
background-size: cover;
background-position: center center;
background-attachment: fixed;
}


.wrapper {
	padding-top: 100px;
	display: flex;
	justify-content: center;
	align-items: center;
	}

/* mobile */
@media only screen and (max-width: 400px) {
		.img_logo {
			display: block;
			max-width: 100%;
		}
}

/* tablet */
@media only screen and (max-width: 1000px) and (min-width: 401px) {
	.img_logo {
		display: block;
		max-width: 75%;
	}
}

/* pc */
@media only screen and (min-width: 1001px) {
	.img_logo {
		display: block;
		max-width: 40%;
	}
}