.nav-menu {
    display: none;
}
.nav-menu:target {
    display: block;
}


.standards {
    display: none;
}

.standards:target {
    display: block;
}

.documents {
    display: none;
}

.documents:target {
    display: block;
}

.methodical {
    display: none;
}

.methodical:target {
    display: block;
}

.parents {
    display: none;
}

.parents:target {
    display: block;
}

.guys {
    display: none;
}

.guys:target {
    display: block;
}