Broken! Making HTML Manageable + CSS Grid

This supports a software dev. class for businesspeople that you can find here: https://www.alexandercowan.com/making-html-manageable And a case you can find here: https://www.alexandercowan.com/making-html-manageable

by Alex Cowan

HTML

<div class="top-bar">
  <ul class="nav-list">
    <li><a href="#">Home</a></li>
    <li><a href="#">Parts</a></li>
    <li><a href="#">Search</a></li>
    <li><a href="#">Help</a></li>
  </ul>

  <div id="search-box">
    <input type="text" name="parts-search" placeholder="Mfg., Model, or Part Number" size=30>
  </div>
</div>

<div id="search-controls">
  <div id="result-sort">
    Sort By
    <select>
      <option value="None">Popularity</option>
      <option value="Acme">Price</option>
      <option value="Bacme">Manufacturer</option>
    </select>
  </div>
  <div id="filter-parts">
    Search By
    <select>
      <option value="None">Manufacturer</option>
      <option value="Acme">Acme</option>
      <option value="Bacme">Bacme</option>
      <option value="Cacme">Cacme</option>
      <option value="Dacme">Dacme</option>
    </select>
    <select>
      <option value="None">Model</option>
      <option value="Acme">TooCool</option>
      <option value="Bacme">TooHot</option>
      <option value="Cacme">JustRight</option>
      <option value="Dacme">Coolerator</option>
    </select>
    <select>
      <option value="None">Type</option>
      <option value="Acme">Sniggler</option>
      <option value="Bacme">Wiggler</option>
      <option value="Cacme">Jiggler</option>
      <option value="Dacme">Tiggler</option>
    </select>
  </div>
</div>

<div class="part-display">
  <div class="catalog-part">
    <img src="https://www.alexandercowan.com/wp-content/uploads/2017/12/PCB-board-150px.png" alt="PCB board">
    <div class="overlay">
      <p>
        Acme #GR1688<br>87 Orders<br>$12.30 Same Day</p>
    </div>
  </div>
  <div class="catalog-part">
    <img src="https://www.alexandercowan.com/wp-content/uploads/2017/12/hvac-fan-photo-2-post-150px.png" alt="PCB board">
    <div class="overlay">
      <p>
        Bacme #BR2048<br>301 Orders<br>$9.20 Two Day</p>
    </div>
  </div>
  <div class="catalog-part">
    <img...

CSS

.top-bar,
#search-box,
.nav-list li,
.nav-list a {
  background-color: #002D45;
  font-family: Proxima Nova, helvetica neue, helvetica, sans-serif;
  font-weight: bold;
  font-size: 110%;
  color: #ffffff;
}

.top-bar {
  color: #FFFFFF;
  height: 40px;
  margin: 0px;
  padding: 10px;
  display: flex;
  align-items: center;
}

.nav-list {
  list-style-type: none;
  padding: 0;
  display: inline;
}

.nav-list li {
  float: left;
}

.nav-list a {
  display: inline;
  padding: 8px;
  text-decoration: none;
}

#search-box {
  margin-left: auto;
  margin-right: 0;
  padding: 10px;
}

#search-controls {
  background-color: #ffffff;
  padding: 15px 15px;
  font-family: 'Lucida Sans Unicode', 'Lucida Grande', sans-serif;
  font-size: 70%;
  display: flex;
  align-items: center;
}


#filter-parts {
  float: right;
  margin-left: auto;
  margin-right: 0;
  padding-right: 5px;
}

.parts-display {
  display: grid;
  grid-template-columns: repeat(auto-fill, 150px);
  justify-content: center;
  grid-auto-rows: auto;
  grid-gap: 0.25rem;
  grid-auto-flow: row;
}

.catalog-part {
  /*
  margin: 2px;
    width: 150px;
  */
  padding: 0px 5px;
  border-style: solid;
  border-color: #808285;
  border-width: 1px;

  height: 200px;
  line-height: 200px;
  float: left;
  display: table-cell;
  position: relative;
 
}

.catalog-part img {
  height: auto;
  vertical-align: middle;
  width: 100%;
}

.overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100%;
  display: inline-table;
  width: 100%;
  opacity: 10;
  transition: 0.5s ease;
  background-color: #f4f4f4;
}

.catalog-part:hover .overlay {
  opacity: 0.75;
}

p {
  font-family: 'Lucida Sans Unicode', 'Lucida Grande', sans-serif;
  line-height: 1;
  overflow: scroll;
}

.catalog-part p {
  vertical-align: middle;
  text-align: center;
  color: black;
  display: table-cell;
  font-size: 80%;
  font-family: 'Lucida Sans Unicode', 'Lucida Grande', sans-serif;
}