function nippon1() {
    document.getElementById("nippon1").style.backgroundColor = "palegreen";
}
function nippon2() {
    document.getElementById("nippon2").style.backgroundColor = "palegreen";
}
function nippon3() {
    document.getElementById("nippon3").style.backgroundColor = "palegreen";
}
function nippon4() {
    document.getElementById("nippon4").style.backgroundColor = "palegreen";
}
function nippon5() {
    document.getElementById("nippon5").style.backgroundColor = "palegreen";
}
function nippon6() {
    document.getElementById("nippon6").style.backgroundColor = "palegreen";
}