#sub_navi{
    position: fixed;
    bottom: 10px;
    left: 0;
    width: 100%;
}

#sub_navi ul{
    margin: 0 40px;
    display:flex;
    justify-content: center;
}
#sub_navi ul li{
    margin: 0 5px;
}
#sub_navi ul li a{
    display: block;
    width: calc((100vw - 50px) /5);
    max-width: 125px;
}
#sub_navi ul li a img{
    width: 100%;
}