.instagram_bg{
    letter-spacing:10px;
	line-height:1.8;
	background:url(../img/instagram-pc.jpg) no-repeat center center;
    background-size: cover;
}

@media screen and (max-width: 640px){
.contents_ttl h1 {
}
.instagram_bg {
    letter-spacing: 5px;
    background:url(../../img/instagram.jpg) no-repeat center center;
    background-size: cover;
}
}