body {
  font-family: 'Open Sans', sans-serif;
  margin: 0;
}

nav {
  background-color: black;
  overflow: hidden;
}

nav a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px;
  text-decoration: none
}

nav a:hover {
  text-decoration-line: none;
}

nav ul {
  display: inline;
}

nav li {
  display: inline;
  padding-left: 5px;
}

.navbar-brand {
  display: inline;
}

.container {
  margin: 2.0em;
}

.footer {
  margin: 2.0em;
}

table {
  border-collapse: collapse;
  border: black 1px;
}

th, td {
  border-color: black;
  border-width: 1px;
  border-bottom-style: solid;
  padding: 0.75rem;
}

.row {
  width: 100%;
}


@media (min-width: 1024px) {
  .span1 {
    width: 32.5%;
    margin: 0.05%;
    display: inline-block;
    vertical-align: top;
  }
}

@media (prefers-color-scheme: dark) {
  body {
    color: #ffffff;
    background-color: black;
  }

  nav {
    background-color: rgba(255, 255, 255, 0.1);
  }

  a {
    color: #ffffff;
  }

  th, td {
    border-color: white;
  }
}