header{
   background-color: #4971b7;
}
.ttl_books__grade{
}
.header_ttl{
}

.ttl_cat{
   width: 100%;
}
nav{
   background-color: #22ac38;
}
.ttl_cat.ttl_cat--c1{
   background-color: #22ac38;
}
.ttl_cat.ttl_cat--c2{
   background-color: #eb6100;
}
.ttl_cat.ttl_cat--c3{
   background-color: #eb6100;
}