showcase.html

<style type="text/css">
  h1 {
    margin: 0;
    font-weight: 200;
  }
  
  .level-container {
    border-radius: 5px;
    color: white;
    display: flex;
    flex-direction: column;
    font-family: helvetica, sans-serif;
    font-weight: 300;
    justify-content: center;
    padding: 10px;
    margin: 3px;
  }
  
  .project-list {
    justify-content: center;
    display: flex;
    flex-wrap: wrap;
  }
  
  #art {
    background-color: #00449F;
  }
  
  #games {
    background-color: #006A63;
  }
  
  .project-block {
    flex: 0 1 150px;
    margin: 10px;
  }
  
  .project-block>a>img {
    width: 100%;
    height: 150px;
    border-radius: 5px;
    margin-bottom: 5px;
  }
  
  .project-block>a:hover,
  .project-block>a {
    text-decoration: none;
    cursor: pointer;
    color: white;
  }
  
  .start-here {
    color: yellow;
    margin-top: 5px;
    display: block;
  }
  
  .first-project {
    border-right: 10px solid rgb(255, 255, 255);
    border-right: 10px solid rgba(255, 255, 255, 0.3);
    padding-right: 20px;
  }
</style>
<div id="projects" style="width: 100%; flex-direction: column; display:flex; margin:auto; text-align:center;">

  <div class="level-container" id="art">
    <h1>Art Showcase</h1>
    <div class="project-list">
      <div class="project-block">
        <a href="./showcase/clock.html">
          <img class="project-image" src="./images/clock-screenshot.png">
          <div>Clock</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/fractal-trees.html">
          <img class="project-image" src="./images/fractal-trees-screenshot.png">
          <div>Fractal Trees</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/mandelbrot.html">
          <img class="project-image" src="./images/mandelbrot-screenshot.png">
          <div>Mandelbrot</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/matrix.html">
          <img class="project-image" src="./images/matrix-screenshot.gif">
          <div>Matrix</div>
        </a>
      </div>
      
      <div class="project-block">
        <a href="./showcase/waves.html">
          <img class="project-image" src="./images/waves-screenshot.gif">
          <div>Waves</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/trig-art.html">
          <img class="project-image" src="./images/trig-art-screenshot.png">
          <div>Trigonometry Art</div>
        </a>
      </div>
    </div>
  </div>

  <div class="level-container" id="games">
    <h1>Game Showcase</h1>
    <div class="project-list">
      <div class="project-block">
        <a href="./showcase/3d-runner.html">
          <img class="project-image" src="./images/3d-runner-screenshot.png">
          <div>3D Runner</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/breakout.html">
          <img class="project-image" src="./images/breakout-screenshot.png">
          <div>Breakout</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/color-picker.html">
          <img class="project-image" src="./images/color-picker-screenshot.png">
          <div>Color Picker</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/minesweeper.html">
          <img class="project-image" src="./images/minesweeper-screenshot.png">
          <div>Minesweeper</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/set.html">
          <img class="project-image" src="./images/set-screenshot.png">
          <div>Set</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/tetris.html">
          <img class="project-image" src="./images/tetris-screenshot.png">
          <div>Tetris</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/ttt-ai.html">
          <img class="project-image" src="./images/ttt-ai-screenshot.png">
          <div>Tic-Tac-Toe (vs AI)</div>
        </a>
      </div>

      <div class="project-block">
        <a href="./showcase/typing.html">
          <img class="project-image" src="./images/typing-screenshot.png">
          <div>Typing Test</div>
        </a>
      </div>

      
    </div>
  </div>

</div>