问如何在菜单中定位悬停时的小空间？

EN

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 20px;
}

.pdng-3 {
  padding: 30px;
}

nav {
    display: flex;
    flex-direction: row;
    justify-content: center;
    background-color: #45372C;
}

ul {
    display: flex;
    list-style: none;
}

li a {
    text-decoration: none;
    padding: 30px;
    color: #000000;
    font-size: 22px;
    font-weight: bold;
    color: #ffffff;
}

 li a:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: -1;
    background-color: #9F8066;
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform .4s ease-in-out;
    
  }
  
  li a:hover:before,
  li a:active:before,
  li a:focus:before {
    transform: scaleY(1);
    transition: .4s;
    color: #ffffff;
    
  }
  
  li a {
    z-index: 1;
    position: relative; 
   
  }

<nav class="pdng-3">
        <ul>
            <li><a href="#">About</a></li>
            <li><a href="#">Shop</a></li>
            <li><a href="#">Story</a></li>
            <li><a href="#">Blog</a></li>
            <li><a href="#">Contact</a></li>
            <li><a href="#">Blog</a></li>
        </ul>
    </nav>