* { margin : 0 ; padding : 0 ; }

/* IE */
@font-face {
font-family: font1;
src: url(https://www.otaiweb.com/fonts/NotoSansCJKjp-DemiLight.otf);
}
/* Firefox, Opera, Safari */
@font-face {
font-family: font1;
src: url(https://www.otaiweb.com/fonts/NotoSansCJKjp-DemiLight.otf) format(�htruetype�h);
}

#my_main { 
width : 100% ; 
background-color: #ffffff;
}

#my_body { position : relative ; 
margin: 0 auto; 
width: 100% ; 
color: #000000;
}

#my_header 
{ height : 1105px ;
background-image: url(img/mainbaner.gif);
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 {

}
/* ‰¡•�640pxˆÈ‰º‚Ì�ê�‡‚Ì‚Ý“K—p */
@media (max-width: 640px) {
  img{
    max-width: 98%;
    height: auto;
  }



h1 {
font-family: font1;
font-size: 1.3rem;
line-height: 30px;
padding-top: 14px;
padding-left: 20px;
padding-bottom: 14px;
padding-right: 20px;
letter-spacing: 10px;
background-color:#BCF807;
color: #878787;
}

h2 {
font-family: font1;
font-size: 1.1rem;
color: #878787;
background-color: #ffee53;
line-height: 30px;
letter-spacing: 10px;
padding-top: 20px;
padding-left: 30px;
padding-right: 30px;
margin-bottom: 30px;
padding-bottom: 20px;
}

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: 15px;
letter-spacing:6px;
font-size:10px;
margin-left: 10%;
margin-right: 10%;
margin-bottom: 50px;
margin-top: 5px;

}

.c{
text-align: left;
font-family: font1;
font-size: 1.0rem;
color: #484848;
line-height: 30px;
letter-spacing: 1px;
margin-top: 50px;
margin-left: 5%;
margin-right: 5%;
margin-bottom: 50px;
}

.setsumei{
font-family: "Noto Sans Japanese", sans-serif;
font-size: 15px;
font-weight: 300;
background-color: #efefef;
line-height: 20px;
letter-spacing: 5px;
margin: 5px;
margin-bottom: 30px;
padding: 20px;
}


.syosai{

font-family: 'Noto Sans Japanese', sans-serif;
font-size: 10px;
font-weight: 300;
line-height: 18px;
letter-spacing:6px;
margin-left: 15%;
margin-right: 10%;
margin-bottom: 50px;
margin-top: 20px;

}

.tokka{
font-family: "Noto Sans Japanese", sans-serif;
font-size: 40px;
font-weight: 800;
color: #ff0000;
line-height: 18px;
letter-spacing: 6px;
margin-top: 20px;


margin-bottom: 0px;
}

.topimg{
 display: block;
  width: 100%;
}



<!-- ƒ{ƒ^ƒ“ -->
.btn{
	width: 20%;
	padding: 10px;
	background: #405dca;
	color: #fff;
	text-align: center;
	display: block;
	text-decoration: none;
}
.btn:hover{
	text-decoration: none;
	background: #364ea5;
}

.square_btn {
    display: inline-block;
    padding: 0.3em 1em;
    text-decoration: none;
    color: #67c5ff;
    border: solid 2px #67c5ff;
    border-radius: 3px;
    transition: .4s;
}

.square_btn:hover {
    background: #67c5ff;
    color: white;
}



.video {
position: relative;
height: 0;
padding: 30px 0 56.25%;
overflow: hidden;
}

.video iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}




BODY{
width : 100% ;
background-color: #f5f5f5;
<!-- background-image: url("img/tex.jpg"); /* ‘S‘Ì‚Ì”wŒi‰æ‘œ */ -->
background-position: 50% 50%;            /* ”wŒi‰æ‘œ‚̈ʒu‚͉æ–Ê’†‰› */
background-attachment:fixed;             /* ”wŒi‰æ‘œ‚ðŒÅ’è‚·‚é */
}


.ggmap {
position: relative;
padding-bottom: 56.25%;
padding-top: 30px;
height: 0;
overflow: hidden;
}
 
.ggmap iframe,
.ggmap object,
.ggmap embed {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}


.fb_iframe_widget > span {
  vertical-align: baseline !important;
}