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CSS

How to get this navigation responsive? And how does the pseudo code look like to change color on .navigation:link???

Is there a way to shorten and simplify this to become a nice and elegant drop down menu? And I don't understand why this menu aint responsive anymore.... I understand that it aint because of my relative units. So I suspect it has something to do with display - flex and flew-flow... Is this correct?

I would really appreciate if anybody here could share their experience and knowledge that you may have about dropdown navigations.

Best regards!

nav {
    background-color: #3A4652;
    width: 100%;
    padding-bottom: 0.525em;    
}

nav ul {
    list-style: none;
}

.navigation {
    display: flex;
    flex-flow: row;
    justify-content: space-between;
    align-items: center;
    white-space: nowrap;
    margin: 0.4em 10em;
    max-width: 100%;
}

.navigation > li {
    position: relative;
    display: inline-block;
    padding: 1rem 2rem;
    padding-bottom: 0.6em;
}

.navigation ul {
    position: absolute;
    z-index: 1010;
    line-height: 2rem;
    left: -9999em;
    border-top: 2px solid black;
    border-right: 2px solid black;
    border-bottom: 2px solid black;
    border-left: 2px solid black;
    padding: 0.210em 2em;
    background-color: #9C7F5A;
}

.navigation ul a {
    display: block;
}

.navigation > li:hover a + ul {
    left: 0;
    top: 100%;
}

.navborder {
    border-top: 3px solid black;
    border-bottom: 3px solid black;
    width: 100%;
}

.bordermenu {
    border-top: 2px solid black;
    border-right: 2px solid black;
    border-bottom: 2px solid black;
    border-left: 2px solid black;
    padding: 0.210em 3em;
    background-color: #9C7F5A;
}

.bordermenu2 {
    border-top: 2px solid black;
    border-right: 2px solid black;
    border-bottom: 2px solid black;
    border-left: 2px solid black;
    padding: 0.210em 3.5em;
    background-color: #9C7F5A;
}

.bordermenu3 {
    border-top: 2px solid black;
    border-right: 2px solid black;
    border-bottom: 2px solid black;
    border-left: 2px solid black;
    padding: 0.210em 2em;
    background-color: #9C7F5A;
}

.bordermenu4 {
    border-top: 2px solid black;
    border-right: 2px solid black;
    border-bottom: 2px solid black;
    border-left: 2px solid black;
    padding: 0.210em 3.235em;
    background-color: #9C7F5A;
}
<header id="top" class="main-header"> 
        <nav class="navborder">
            <ul class="navigation nav-open" id="nav">
                <li><a href="index.html" class="selected bordermenu">Hjem</a></li>
                <li><a href="#" class="bordermenu2">Om</a>
                    <ul class="submenu">
                        <li><a href="#">Om Naturens Fristelser</a></li>
                        <li><a href="#">Om Meg</a></li>
                    </ul>
                </li>
                <li><a href="#" class="bordermenu3">Gresskarkjerneolje</a>
                    <ul class="submenu">
                        <li><a href="#">Om Oljen</a></li>
                        <li><a href="#">Bestill Oljen</a></li>
                        <li><a href="#">Eksport</a></li>
                    </ul>
                </li>
                <li><a href="#" class="bordermenu4">Kontakt</a></li>
            </ul>
        </nav>
        <div class="title">
            <span>Nettstedet der god mat lages</span>
            <h1>Naturens Fristelser</h1>
        <img src="img/arrow.svg" class="arrow" alt="Down arrow">
        </div>
    </header>