What is the best way to eliminate the box-shadow on the top of a dropdown menu using CSS?

Can someone assist me with removing the top box-shadow in CSS? Check out the image for reference:

You can view a live demo here: www.hobbu.org

Below are some code snippets:

HTML

<nav>
  <ul class="container_12">
    <li><a href="#">Home</a>
      <ul>
        <li><a href="#">Support</a></li>
        <li><a href="#">Einstellungen</a></li>
        <li><a href="#">Ausloggen</a></li>
      </ul>
    </li>
    <li><a href="#">Community</a></li>
    <li><a href="#">Extras</a></li>
    <li><a href="#">Shop</a></li>
  </ul>
</nav>

CSS

nav {
  width: 100%;
  height: 50px;
  background-color: #fff;
  position: relative;
  box-shadow: 0 2px 10px 0 rgba(0, 0, 0, .16);
  -webkit-box-shadow: 0 2px 10px 0 rgba(0, 0, 0, .16);
  -moz-box-shadow: 0 2px 10px 0 rgba(0, 0, 0, .16);
}

// Rest of the CSS code goes here...

I have already adjusted the dropdown z-index, but the issue persists as both the navigation and dropdown menus have the same box-shadow style.

Please excuse any language errors, English is not my native tongue.

Answer №1

Interestingly, the solution to your query lies in an often overlooked aspect of the box-shadow property:

The ‘box-shadow’ feature allows for the attachment of multiple drop-shadows to a box. These shadows are specified as a list, ordered from front to back. Each shadow is defined using a <shadow> notation, comprising of 2-4 length values, an optional color, and an optional ‘inset’ keyword.
<shadow> = inset? && {2,4} && ?

Your current style rule

box-shadow: 0 2px 10px 0 rgba(0, 0, 0, 0.16)
represents just one of the potential <shadow>s mentioned above.

To enhance this, you can introduce a preceding (front) <shadow> with tailored attributes, such as:

box-shadow: #fff 0 -5px, 0 2px 10px 0 rgba(0, 0, 0, 0.16)
, where the initial instance consists of:

  • #fff should match the base <ul> color
  • 0 removes horizontal (right) shadow
  • -5px creates a vertical shadow (upwards in this case due to the negative sign), effectively concealing the top shadow produced by the original singular (now secondary) instance

You must now address the issue of the red bottom border on your <ul> element, which is also hidden: the approach to remedying this is left to your discretion.

Answer №2

Consider updating the CSS for your dropdown like so:

  box-shadow: 0 5px 10px -2px rgba(0,0,0,.16);
  -webkit-box-shadow: 0 5px 10px -2px rgba(0,0,0,.16);

Answer №3

It seems like you're looking for a way to keep the box-shadow property on both elements, without removing it entirely. One solution is to nest the sub menu (the inner <ul> element) inside another element, such as a <div>. Then, adjust the CSS of the inner <ul> and outer <div> to hide only the top shadow while showing all other shadows.

I've prepared a fiddle with the solution. You can view it here: http://jsfiddle.net/c5nLay4L/2/

In essence, we're setting the outer <div> (with class = "submenu-container") to hide any overflow content by using overflow: hidden. This will hide all shadows, so we add padding to all sides except the top. By positioning this outer div absolutely and adjusting its position to match the inner submenu <ul>, we achieve the desired effect.

Why altering z-index won't suffice Changing the z-index value affects the stacking context of an element and its parent. When giving the nav element a higher z-index, it establishes a stacking context for the parent, affecting how the z-index of the inner <ul> behaves within that context.

To delve deeper into this concept, consider a chair with a book resting on it. Lifting the chair raises both items, but raising just the book does not affect the chair. The book cannot go under the seat of the chair unless the stacking context changes to allow it. Similarly, changing the relationship between parent-child containers is necessary for z-index adjustments to take full effect.

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