html - CSS overlay that takes 100% of parent element height -

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i need element in snippet tinted darker. this, have overlay element black partial transparency. cover red element in it's entirety. problem is, can't overlay 100% height. why won't work, , how can work without specifying exact heights?

.overlay-shell {    position: relative;    top: 0;    left: 0;  }    .overlay {    background-color: rgba(0, 0, 0, 0.5);    top: 0;    left: 0;    height: 60px; /* how take 100% of height? */    width: 100%;    position: absolute;  }    ul.alarms {    list-style: none;    margin: 0 30px;  }    ul.alarms li.alarm {    background-size: 100%;    background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #c53635), color-stop(50%, #9d2b2a), color-stop(51%, #952928), color-stop(100%, #9d2b2a));    background-image: -moz-linear-gradient(#c53635 0%, #9d2b2a 50%, #952928 51%, #9d2b2a 100%);    background-image: -webkit-linear-gradient(#c53635 0%, #9d2b2a 50%, #952928 51%, #9d2b2a 100%);    background-image: linear-gradient(#c53635 0%, #9d2b2a 50%, #952928 51%, #9d2b2a 100%);  }    ul.alarms .content {      }    ul.alarms li .right-sidebar {    float: right;    max-width: 180px;  }    ul.alarms .bottom-bar {    clear: both;  }    .response-btn {    display: inline-block;    width: 20%;    text-align: center;    margin: 0px;    padding: 0px;   }
<html>  <ul class="alarms">    <li class="alarm" id="alert_87590">      <div class="overlay-shell">        <div class="overlay"></div>      </div>      <div class="content">        <div class="primary">          <a href="/senior/1828"><h1 class="provisioned-service-name">hannah montana</h1>            </a>        </div>      </div>      <div class="right-sidebar">        <p>          <a class="address" href="/senior/1828">unit 128</a>        </p>      </div>      <div class="bottom-bar">          <div class="response-btn">            <span>yes</span>          </div><div class="response-btn">            <span>ok</span>          </div><div class="response-btn">            <span>thank you</span>          </div><div class="response-btn">            <span>custom</span>          </div><div class="response-btn">            <span>roger</span>        </div>      </div>    </li>  </ul>    </html>

set height of .overlay 100vh equal the viewport height:

overlay {   background-color: rgba(0, 0, 0, 0.5);   top: 0;   left: 0;   height: 100vh;   width: 100%;   position: absolute; }

still black overlay whole height of page


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