Çözüldü Margin özelliği çalışmıyor

<main class="mother-main">

<section class="header-area">
<header class="header-main-area">

    <div class="logo-linkprimary">
        <div class="logo">
            <img src="img/logo.png" class="logo-image" alt="">
        </div>

        <nav class="navigation">
            <ul>
                <li><a href="hospital/hastanemiz.html">Hastanelerimiz</a></li>
                <li><a href="tıbbi-birimler/tibbi-bolumler.html">Tıbbi Birimlerimiz</a></li>
                <li><a href="hekimler.html">Hekimlerimiz</a></li>
                <li><a href="saglik-katalog.html">Sağlık Kataloğu</a></li>
                <li><a href="iletisim.html">İletişim</a></li>
            </ul>
        </nav>
        </div>

</header>
</section>

<section class="slider-area">

</section>

</main>

*
{
    margin: auto;
    padding: 0;
    text-align: justify;
    font-family: Exo, -apple-system, BlinkMacSystemFont, Segoe UI,
 Roboto, Oxygen-Sans, Ubuntu, Cantarell, Helvetica Neue, sans-serif;
 box-sizing: border-box;
}
body
{
    height: 100%;
    color: #000;
}
.mother-main
{
    width: 100%;
    height: 100%;
}
.header-area
{
    width: 100%;
    height: 70px;
    background-color:#F15A29;
    position: fixed;
    z-index: 1;
}

.logo-linkprimary
{
    width:90%;
    height: 50px;

    margin-top: 10px;
    margin-left: 50px;
    display: flex;
}
.logo
{
    width:200px;
    height: 45px;
    text-align: center;

}
.navigation
{
    width:730px;
    height: 50px;
    margin-left: 10px;
}
.logo-image
{
    position: relative;
    top:20%;
}
ul
{
    width: 727px;
    height: 35px;
    float: left;

    margin-top: 7px;
    margin-left: 10px;
    display: flex;
    justify-content: flex-start;
}

li
{
    list-style-type: none;
    width: 136px;
    float: left;
    margin-left: 7px;
    vertical-align: middle;
    margin-top: 6px;
    text-align: center;
    position: relative;
    color: #fff;
 
}
li::before
{
    width: 6px;
    height: 6px;
    background-color: #fff;
    list-style-type: disc;
    position: absolute;
    content: '';
    top:50%;
    border-radius: 50%;

}
.header-main-area
{
    width: 100%;
    height: 70px;
    display: flex;
    flex-wrap: nowrap;

}
li:nth-child(1)::before
{
    display: none;
}

li:nth-child(2)::before
{
    top:45%;
    left: 0px;
}
li:nth-child(2)
{
    width: 160px;
    padding-left: 5px;
    box-sizing: border-box;
}
li:nth-child(3)
{
    width: 140px;
    padding-left: 5px;
    box-sizing: border-box;
}
li:nth-child(5)
{
    width: 82px;
}
li:nth-child(4)
{
    width: 160px;
}
li:nth-child(3)::before
{
    top:45%;
    left: 6px;
}
li:nth-child(4)::before
{
    top:45%;
    left: 7px;
}
li:nth-child(5)::before
{
    top:45%;
    left: 0px;
}
a
{
    text-align: center;
    text-decoration: none;
    font-size: 17px;
    font-weight: 500;
    text-transform: capitalize;
    color: #fff;
    width: auto;
    height: auto;
    ;
}
.slider-area
{
    width:100%;
    height: 300px;
    background-color: aqua;
margin-top: 20px;
 
}