#main:not(.index) {
    padding-top: 60px;
    margin-bottom: auto;
}

#header_navbar > .navbar {
    height: 60px;
}

@media (max-width: 572px) {
    #main:not(.index) {
        padding-top: 80px;
    }

    #header_navbar > .navbar {
        height: 80px;
    }
}

#header > #header_navbar > .fixed,.sticky {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
}

#navbar_menu_mobile > a {
    display: block;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    padding-right: 1.5rem;
    padding-left: 1.5rem;
}

/* menu button -> */
.navbar_menu_btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    row-gap: 8px;
    
    border: none;
    background: none;
}
  
.navbar_menu_btn_line,
.navbar_menu_btn::before,
.navbar_menu_btn::after {
    content: "";
    width: 24px;
    height: 2px;
    background-color: #808080;
    transition: transform 0.3s, opacity 0.3s;
}

.navbar_menu_btn.is-opened .navbar_menu_btn_line {
    opacity: 0;
}

.navbar_menu_btn.is-opened::before {
    transform: translateY(10px) rotate(-45deg);
}

.navbar_menu_btn.is-opened::after {
    transform: translateY(-10px) rotate(45deg);
}
/* <- menu button */