it looks like the shadow to div.logo works fine
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
a{
text-decoration: none;
}
#landing{
position: absolute;
width: 100vw;
height: 100vh;
background: url(/html/img/landing\ background.png) no-repeat center center/cover;
}
#main-nav{
position: relative;
top: 5%;
margin: auto;
width: 90%;
background: #007FFF 0% 0% no-repeat padding-box;
box-shadow: 0px 10px 40px #00000029;
border-radius: 40px;
opacity: 0.9;
}
#main-nav *{
border: 1px black soli
}
#main-nav .container{
display: flex;
flex-direction: row;
flex-wrap: wrap;
align-items: center;
}
#main-nav .container .logo {
width: 7%;
height: 5%;
background-color: #FFFFFF;
border-radius: 3rem;
transform: scale(1.1);
z-index: 2;
box-shadow: 5px 10px #00000029;
}
#main-nav .container .logo img{
position: relative;
max-width: 100%;
height: auto;
}
<body>
<div id="landing">
<nav id="main-nav">
<div class="container">
<div class="logo">
<a href="#"><img src="./img/logo_final-final.png" alt=""></a>
</div>
<div class="nav-btns btns-container">
<div><a href="#">Home</a></div>
<div><a href="#">Store</a></div>
<div><a href="#">Offers</a></div>
<div><a href="#">FAQs</a></div>
<div><a href="#">Contact Us</a></div>
</div>
</div>
</nav>
</div>
</body>