.custom_header_cont {
    width: var(--std-container-width);
    margin: 0 auto;
    display: flex;
}

#logo_sitri {
    flex: 0 50%;
    height: auto;
}

#logo_sitri img {
    width: 200px;
    object-fit: contain;
    object-position: left center;
}

.logo_mobile {
    display: none;
}

.side_menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 16%;
    height: 100vh;
    background-color: #1f2446;
    z-index: 999;
    display: flex;
    align-items: center;
}

.side_menu ul {
    width: 100%;
    margin-top: 180px;
}

.side_menu ul li {
    list-style-type: none;
    margin-bottom: 20px;
    position: relative; 
}

.side_menu ul li a {
    font-size: 20px;
    color: #fff;
    display: inline-block;
    position: relative;
    padding: 0 0 10px 0;
}

.side_menu ul li a:after {    
    background: none repeat scroll 0 0 transparent;
    bottom: 0;
    content: "";
    display: block;
    height: 2px;
    left: 0;
    position: absolute;
    background: #fff;
    transition: width 0.3s ease 0s, left 0.3s ease 0s;
    width: 0;
}

.side_menu ul li a:hover:after { 
    width: 100%; 
    left: 0; 
}

#burger_menu,
#overlay_mobile {
    display: none;
}

#kopa-header-top {
    position: relative;
    z-index: 9;
}

#kopa-header-bottom {
    z-index: 9;
    background-color: #fff;
}

@media screen and (max-width: 1340px) {
    .side_menu {
        width: 12%;
    }   

    .side_menu ul {
        padding-left: 15px;
    }

    .side_menu ul li a {
        font-size: 18px;
    }
}

@media screen and (max-width: 1280px) {

    header {
        position: fixed;
        top: 0;
        left: 0;
        z-index: 9999;
        width: 100%;
        background-color: transparent;
    }

    .logo_mobile {
        display: block;
    }

    .logo_desktop {
        display: none;
    }

    .custom_header_cont {
        padding-bottom: 10px;
    }

    .side_menu {
        display: none !important;
    }

    #logo_sitri img {
        width: unset;
        height: 80px;
        margin-top: 10px;
    }

    #burger_menu {
        display: flex;
        flex: 0 50%;
        justify-content: flex-end;
        align-items: center;
        position: relative;
        top: 150px;
    }

    .custom_menu {
        width: 45px;
        height: 45px;
        border: 3px solid #fff;
        border-radius: 50%;
        display: inherit;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        background-color: #1f2446;
        position: relative;
        z-index: 99999;
    }

    .custom_menu span {
        display: block;
        height: 4px;
        width: calc(100% - 15px);
        margin: 0 auto;
        border-radius: 10px;
        background-color: #fff;
        transition: 0.6s;
        -webkit-transition: 0.6s;
        position: relative;
        opacity: 1;
    }

    .custom_menu span:nth-of-type(2) {
        margin: 5px 0;
        left: 0;
        transition: 0.9s;
        -webkit-transition: 0.9s;
    }

    .custom_menu span.active:first-of-type {
        transform: rotate(130deg) translate(7px, -5px);
        -webkit-transform: rotate(130deg) translate(7px, -5px);
    }

    .custom_menu span.active:nth-of-type(2) {
        left: -30px;
        opacity: 0;
    }

    .custom_menu span.active:last-of-type {
        transform: rotate(-313deg) translate(-7px, -5px);
        -webkit-transform: rotate(-313deg) translate(-7px, -5px);
    }

    #overlay_mobile {
        display: flex;
        align-items: center;
        justify-content: flex-end;
        position: fixed;
        top: 0;
        right: -50%;
        width: 50%;
        height: 100vh;
        background-color: #1f2446;
        z-index: 9999;
        transition: 0.6s;
        -webkit-transition: 0.6s;
    }

    #overlay_mobile.active {
        right: 0;
    }

    .side_menu_mobile ul  {
        padding-left: 0;
        padding-right: 20px;
        list-style-type: none;
        margin-top: 60px;
    }

    .side_menu_mobile ul li {
        text-align: right;
        margin-bottom: 15px;
    }

    .side_menu_mobile ul li:last-of-type {
        margin-bottom: 0;
    }

    .side_menu_mobile ul li a {
        color: #fff;
        font-size: 18px;
        transition: 0.3s;
        -webkit-transition: 0.3s;
    }

    .side_menu_mobile ul li a:hover {
        opacity: 0.7;
    }
}

@media screen and (max-width: 768px){
    ul#mobile-menu li ul.sub-menu {
        display: none;
    }
}