.content {
	margin: 0px auto; padding: 0; height: 1500px; position: relative; 
}







/* sp_Nat */
.content_nat {
	margin-right: auto;
	margin-left: auto;
	margin-bottom: 0px;
	padding: 0;
	height: 1275px;
	position: relative;
}

.first_nat {
	background: #fff url("image/natural_phot04.png") no-repeat fixed;
	background-size: 100%;
	min-height: 980px;
	margin: 2000 auto 0; 
	margin-right: auto;
	margin-left: auto;
	width: 100%;
	position: relative;
    }
    
.first_nat .inner {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, 0.5);
	top: 0px;
	margin-top: 33%;
}

/* sp_Nat2 */
.content_nat2 {
	margin-right: auto;
	margin-left: auto;
	margin-bottom: 0px;
	padding: 0;
	height: 1275px;
	position: relative;
}

.first_nat2 {
    background: #fff url("image/natural_phot05.png") no-repeat fixed;
    background-size:100%;
    min-height: 1000px;
	margin: 2000 auto 0; 
    width: 100%; 
    position: relative;
    
    }
    
.first_nat2 .inner {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, 0.5);
	top: 0px;
	margin-top: 33%;
}

/* sp_Nat3 */
.content_nat3 {
	margin-right: auto;
	margin-left: auto;
	margin-bottom: 0px;
	padding: 0;
	height: 1275px;
	position: relative;
}

.first_nat3 {
    background: #fff url("image/natural_phot06.png") no-repeat fixed;
    background-size:100%;
    min-height: 1000px;
	margin: 2000 auto 0; 
    width: 100%; 
    position: relative;
    
    }
    
.first_nat3 .inner {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, 0.5);
	top: 0px;
	margin-top: 33%;
}



/* sp_metal */
.content_metal {
	margin-right: auto;
	margin-left: auto;
	margin-bottom: 0px;
	padding: 0;
	height: 1275px;
	position: relative;
}

.first_metal {
	background: #fff url("image/metal_phot03.png") no-repeat fixed;
	background-size: 100%;
	min-height: 980px;
	margin: 2000 auto 0; 
	margin-right: auto;
	margin-left: auto;
	width: 100%;
	position: relative;
    }
    
.first_metal .inner {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, 0.5);
	top: 0px;
	margin-top: 33%;
}

/* sp_metal2 */
.content_metal2 {
	margin-right: auto;
	margin-left: auto;
	margin-bottom: 0px;
	padding: 0;
	height: 1275px;
	position: relative;
}

.first_metal2 {
    background: #fff url("image/metal_phot04.png") no-repeat fixed;
    background-size:100%;
    min-height: 1000px;
	margin: 2000 auto 0; 
    width: 100%; 
    position: relative;
    
    }
    
.first_metal2 .inner {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, 0.5);
	top: 0px;
	margin-top: 33%;
}

/* sp_metal3 */
.content_metal3 {
	margin-right: auto;
	margin-left: auto;
	margin-bottom: 0px;
	padding: 0;
	height: 1275px;
	position: relative;
}

.first_metal3 {
    background: #fff url("image/metal_phot05.png") no-repeat fixed;
    background-size:100%;
    min-height: 1000px;
	margin: 2000 auto 0; 
    width: 100%; 
    position: relative;
    
    }
    
.first_metal3 .inner {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, 0.5);
	top: 0px;
	margin-top: 33%;
}

/* sp_ceram */
.content_ceram {
	margin-right: auto;
	margin-left: auto;
	margin-bottom: 0px;
	padding: 0;
	height: 1275px;
	position: relative;
}

.first_ceram {
	background: #fff url("image/ceram_phot03.png") no-repeat fixed;
	background-size: 100%;
	min-height: 980px;
	margin: 2000 auto 0; 
	margin-right: auto;
	margin-left: auto;
	width: 100%;
	position: relative;
    }
    
.first_ceram .inner {
	position: absolute;
	width: 100%;
	background: rgba(255, 255, 255, 0.5);
	top: 0px;
	margin-top: 33%;
}