* { margin : 0 ; padding : 0 ; }

@import url(http://fonts.googleapis.com/earlyaccess/notosansjapanese.css);

#my_main { 
background-color: #ffffff;
}

#my_body { position : relative ; 
margin: 0 auto; 
color: #000000;
}

#my_header 
{ height : 900px ;
background-image: url(img/mainbanner.jpg);
background-position: 50% 0%;
background-repeat: no-repeat;}


#my_navigation
{
font size=30%;
height : 20px ;
font-size: 10px;
letter-spacing: 1px;
padding-top: 12px;
padding-left: 5px;
padding-bottom: 3px;
margin-bottom: 20px;

}

#my_sns
{
height : 20px ;
padding-top: 3px;
padding-left: 5px;
padding-bottom: 10px;

}

#my_footer { 
height : 20px ;
font-size: 10px;
letter-spacing: 1px;
padding-top: 12px;
padding-left: 5px;
padding-bottom: 3px;
margin-bottom: 20px;

}

#my_contents {

}
/* 横幅640px以下の場合のみ適用 */
@media (max-width: 640px) {
  img{
    max-width: 100%;
    height: auto;
  }
}


h1 {
font-family: 'Noto Sans Japanese', sans-serif;
font-weight: 500;

margin-top: 5%;
margin-bottom: 15%;
margin-left: 5%;
margin-right: 5%;
letter-spacing: 5px;

}

h2 {
font-family: "Noto Sans Japanese", sans-serif;
font-size: 18px;
font-weight: 400;
color: #ffffff;
background-image: url("img/tex2.jpg");
line-height: 40px;
letter-spacing: 5px;
margin-top: 5%;
padding-left: 20px;
padding-right: 10px;
padding-top: 5%;
padding-bottom: 5%;
margin-bottom: 5%;
}

h3 {
font-family: 'Noto Sans Japanese', sans-serif;
font-weight: 400;
font size:100%;
	margin-top: 50px;
	margin-bottom: 20px;
	line-height: 30px;
}

img {
    border-style:none;
}

br {
letter-spacing: 0;
}




.b{
font-family: 'Noto Sans Japanese', sans-serif;
font-weight: 300;
line-height: 50px;
letter-spacing:6px;
font-size:10px;
margin-left: 10%;
margin-right: 5%;
margin-bottom: 50px;
margin-top: 5px;

}


.c{
font-family: "Noto Sans Japanese", sans-serif;
font-weight: 300;
font-size:12px;
color: #585858;
line-height: 20px;
letter-spacing: 3px;
margin-top: 20px;
margin-left: 5%;
margin-right: 5%;
margin-bottom: 50px;
}


BODY{
width : 100% ;
background-color: #f5f5f5;
<!-- background-image: url("img/tex.jpg"); /* 全体の背景画像 */ -->
background-position: 50% 50%;            /* 背景画像の位置は画面中央 */
background-attachment:fixed;             /* 背景画像を固定する */
}