body {
    margin: 0;
    background-color: black;
    color: white;

    display: flex;
    justify-content: center;   /* horizontal */
    align-items: center;       /* vertical */
    height: 100vh;             /* full screen height */
    text-align: center;
}
.center {
  text-align: center;
}

.bottomnav {
  overflow: hidden;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: black;
  text-emphasis-color: white;
  position: fixed;
}
.bottomnav a {
  float: center;
  display: block;
  color: white;
  text-align: center;
  padding: 16px;
  text-decoration: none;
}

.SubHeading {
    font-size: 1.5em;
    margin-top: 20px;
    padding-bottom: 12px;
}

.square {
    width: 200px;
    height: 400px;
    background-color: rgb(230, 230, 230);
    margin: 200px auto;
    border-radius: 10px;
    position: fixed;
    left: 400px;
    top: 500px;
}

.square2 {
    width: 200px;
    height: 400px;
    background-color: rgb(255, 255, 255);
    margin: 200px auto;
    border-radius: 10px;
    position: fixed;
    right: 400px;
    top: 500px;
}