Problem with hover

I'm starting my studies in html / css so I downloaded a layout to try to develop. I'm in a part of the site that is like a photo gallery, I managed to do exactly what I wanted, but I had a problem with hover.

What should happen is: you hover over the image and its description appears.

The problem is that even with the mouse over the list item, the description disappears.

Here's the code: link

HTML

<section class="works">
        <div class="container">
           <div class="our-works">
            <h2 class="title-section">Our Works</h2>
            <ul class="list-works">
                <li class="item-works"><img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                        <div class="desc-works">
                        <h2 class="subtitle">Work</h2>
                        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
                        </div>
                    </div>
                </li>
                <a class="item-works" href="#">
                   <img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                      <div class="desc-works">
                       <h2 class="subtitle">Work</h2>
                       <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p> 
                       </div>
                    </div>
                </a>
                <li class="item-works"><img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                       <div class="desc-works">
                        <h2 class="subtitle">Work</h2>
                        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
                        </div>
                    </div>
                </li>
                <li class="item-works"><img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                       <div class="desc-works">
                        <h2 class="subtitle">Work</h2>
                        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. </p>
                        </div>
                    </div>
                </li>
                <li class="item-works"><img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                       <div class="desc-works">
                        <h2 class="subtitle">Work</h2>
                        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
                        </div>
                    </div>
                </li>
                <li class="item-works"><img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                       <div class="desc-works">
                        <h2 class="subtitle">Work</h2>
                        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
                        </div>
                    </div>
                </li>
                <li class="item-works"><img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                       <div class="desc-works">
                        <h2 class="subtitle">Work</h2>
                        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
                        </div>
                    </div>
                </li>
                <li class="item-works"><img src="image/work1.png" alt="Work" class="img-works">
                    <div class="sub-works">
                       <div class="desc-works">
                        <h2 class="subtitle">Work</h2>
                        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
                        </div>
                    </div>
                </li>
            </ul>
            </div>
        </div>
    </section>

CSS

.item-works {
    z-index: 99999;
    display: block;
    float: left;
    width: 24%;
    height: 8em;
    overflow: hidden;
    position: relative;
}

.item-works:hover .sub-works {
    display: inherit;
    overflow: hidden;
    cursor: pointer;
}

.item-works:hover .sub-works {
    animation-name: hoverwork;
    animation-duration: 1s;
    animation-timing-function: ease-in;
}

.sub-works {
    display: none;
    height: 0%;
    position: absolute;
    background-color: #00aeff;
    top: 0;
    color: #fff;
}

.desc-works {
    margin-top: 1em;
    text-align: center;
}

.desc-works p {
    width: 70%;
    margin: 0 auto;
}

.img-works {
    max-width: 100%;   
}

@keyframes hoverwork {
    0% {height: 0;}
    50% {height: 100%;}
    75% {height: 95%}
    100% {height: 100%;}
}