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menu_top/two_levels/example_4

A Pen By Hleb Bandarenka

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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HTML

            
              <div class="wrapper">
        <div class="menu_top clearfix">
            <ul>
                <li><a href="">Category 01</a>
                    <ul>
                        <li><a href="">Product 01 - 1</a></li>
                        <li><a href="">Product 01 - 2</a></li>
                        <li><a href="">Product 01 - 3</a></li>
                    </ul>
                </li>
                <li><a href="">Category 02</a>
                    <ul>
                        <li><a href="">Product 02 - 1</a></li>
                        <li><a href="">Product 02 - 2</a></li>
                        <li><a href="">Product 02 - 3</a></li>
                        <li><a href="">Product 02 - 4</a></li>
                    </ul>
                </li>
                <li><a href="">Category 03</a>
                    <ul>
                        <li><a href="">Product 03 - 1</a></li>
                        <li><a href="">Product 03 - 2</a></li>
                    </ul>
                </li>
                <li><a href="">Category 04</a>
                    <ul>
                        <li><a href="">Product 04 - 1</a></li>
                        <li><a href="">Product 04 - 2</a></li>
                        <li><a href="">Product 04 - 3</a></li>
                        <li><a href="">Product 04 - 4</a></li>
                        <li><a href="">Product 04 - 5</a></li>
                    </ul>
                </li>
                <li><a href="">Category 05</a></li>
                <li><a href="">Category 06</a></li>
                <li><a href="">Category 07</a>
                    <ul>
                        <li><a href="">Product 07 - 1</a></li>
                        <li><a href="">Product 07 - 2</a></li>
                    </ul>
                </li>
                <li><a href="">Category 08</a></li>
                <li><a href="">Category 09</a></li>

            </ul>
        </div>
    </div>

    <div class="wrapper">
        <p><b>visible:hidden + opacity: 0</b></p>

        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ducimus eum labore porro quae, recusandae sint. Ab
           ipsa numquam optio ratione voluptate? Adipisci doloribus explicabo fuga fugit magnam minus nihil porro.</p>

        <p>Amet consequatur cum dolores est laboriosam mollitia non nostrum, ratione temporibus voluptas! Accusantium,
           assumenda debitis ducimus harum incidunt libero molestiae mollitia reiciendis vel velit. Esse facere iste
           laboriosam nobis ut!</p>

        <p>Accusamus assumenda autem debitis deserunt, dolore ducimus ex harum incidunt ipsam ipsum iste iure nemo neque
           nisi obcaecati officia pariatur possimus praesentium quidem recusandae sed sequi tempore ullam vel,
           voluptas!</p>

        <p>Ad dolore dolorem eligendi fuga incidunt, ipsa, iusto non nostrum numquam obcaecati odit, officiis quam quia
           reiciendis totam vitae voluptatem. Corporis debitis eveniet explicabo ipsa magnam maiores maxime, modi
           natus!</p>

        <p>Ad asperiores culpa dolore ea esse impedit nostrum odio quasi, quidem, quis recusandae reiciendis repudiandae
           vel! A ab mollitia natus quos voluptate! Ab debitis deserunt, ea eveniet repellat similique voluptas!</p>

        <p>Ab aliquid animi debitis dolore esse explicabo fugit hic id, labore laborum magnam quae, repellendus rerum,
           sit velit? Aspernatur assumenda dolor ea facilis, fugiat maiores natus quod sunt totam vitae.</p>

        <p>Dolorum est, expedita facere illo illum libero neque, odio quia repellendus reprehenderit velit voluptate?
           Animi autem, eveniet excepturi exercitationem impedit inventore itaque, molestiae neque perspiciatis
           provident reiciendis reprehenderit repudiandae voluptatum.</p>

        <p>Amet dolore est, eum expedita minima molestias nesciunt odio quidem recusandae, reiciendis tempora ut? Ad
           asperiores delectus hic iste, minima nobis praesentium sunt tenetur? Doloribus est fuga incidunt modi
           temporibus!</p>

        <p>Ab accusantium animi consequatur, cupiditate dolorum ea ex explicabo facilis fugit laudantium libero officia
           quidem quo rem veniam. Facilis fugit nobis sed! A asperiores fugiat illum. Dicta eveniet ex optio.</p>

        <p>Alias delectus dignissimos doloremque eaque earum eligendi eos excepturi illo in ipsam labore laudantium
           magnam, maiores molestiae molestias nam nisi numquam obcaecati praesentium quasi quidem quo repudiandae
           sapiente similique soluta?</p>

        <p>Accusantium aliquid, aperiam cumque dignissimos doloremque dolores ducimus eius eveniet expedita fuga
           incidunt magni maiores molestiae nam natus nemo neque non quisquam quo saepe sapiente soluta vel veniam
           veritatis voluptate.</p>

        <p>Accusamus cum illo ipsum laboriosam pariatur quae similique ullam unde. A aliquid asperiores aspernatur
           commodi culpa dolor, doloribus ea, earum exercitationem explicabo hic iure iusto maiores quas qui quis
           voluptatibus?</p>

        <p>Consectetur ea enim error facilis iure officia repudiandae sit! Ab asperiores aspernatur cupiditate deleniti
           distinctio doloribus eaque eos, excepturi illum impedit nemo nesciunt quam quasi qui quis repellat
           reprehenderit sequi.</p>

        <p>Cum, expedita, quia. Consequatur facilis harum illo laboriosam maiores officiis placeat praesentium quae quas
           vel! Accusantium aspernatur, aut enim expedita fuga incidunt quibusdam vero. Dicta facilis natus nobis quod
           suscipit.</p>

        <p>Eaque enim magni sapiente? A ab adipisci, aspernatur, assumenda commodi consectetur consequatur, dolorem
           dolorum ea eius eos esse laborum nisi officiis praesentium quaerat quas qui recusandae tenetur vero voluptas
           voluptates!</p>

        <p>Accusantium atque blanditiis consectetur deserunt fuga fugiat harum id, in ipsum iste magni modi nemo
           nesciunt nisi officiis possimus, quisquam reprehenderit, repudiandae sed similique tempora unde velit
           voluptates? Mollitia, numquam?</p>

        <p>Amet excepturi harum nemo sed. In, itaque, repudiandae. Quaerat, quod, temporibus! Adipisci dignissimos
           doloremque eaque eum odit, officiis recusandae saepe sapiente unde velit. Ducimus eius error fugiat, maiores
           quibusdam quis!</p>

        <p>At ex labore laboriosam magni recusandae voluptas? Minima nesciunt sunt voluptatum? Ad aut commodi
           consectetur consequuntur cumque doloremque ducimus, in iste laboriosam laudantium placeat, sed sint sit,
           soluta voluptates voluptatibus.</p>

        <p>Accusantium asperiores beatae cupiditate dicta doloremque eaque earum excepturi facere facilis hic labore,
           laboriosam laborum magnam molestias mollitia natus necessitatibus nulla odit quam quibusdam quod ratione
           reprehenderit sed veniam voluptas?</p>

        <p>A dignissimos explicabo in numquam obcaecati optio reiciendis rem sapiente suscipit voluptate. Earum et fuga
           iste itaque, maxime non placeat qui quibusdam quo vitae. Consequuntur deserunt necessitatibus nulla quos
           voluptate!</p>
    </div>
!

CSS

            
              .wrapper {
    margin: 0 auto;
    width: 600px;
}

.menu_top ul {
    padding: 0;
    margin: 0;
    list-style: none;
}

.menu_top > ul > li { /* 1-ый уровень */
    float: left;
    padding: 5px;
    border: 1px black solid;
    background: #fffa6e;
}

.menu_top > ul > li > ul { /* 2-ой уровень */
    visibility: hidden; /* скрываем подменю */
    opacity: 0; /* NEW */

    position: absolute; /* Если не будет absolute, то все элементы будут строиться внутри существующего*/

    background: #f2ffe8;

    transition: opacity 1s ease-out; /* То, ради чего мы все это затеяли: CSS анимация */
}

.menu_top > ul > li:hover > ul {
    visibility: visible; /* подменю появляется */
    opacity: 1; /* NEW */
}

.clearfix:before,
.clearfix:after {
    content: " ";
    display: table;
}

.clearfix:after {
    clear: both;
}
!

JS
!
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