header.header nav.pc-nav.m-width-1260 {
    margin: 0;
}
.header-box {
    display: flex;
    justify-content: space-around;
    align-items: center;
}
@media (max-width: 1280px) and (min-width: 1200px) {
    .m-width-1260 {
    max-width: 960px !important;
    }
}