:root {
  color-scheme: dark;
}

body {
  margin: auto;
}

a {
  color: white;
}

.hidden {
  display: none;
}

.container {
  display: grid;
  grid-template-columns: 160px auto 160px;
  margin: auto;
  max-width: 1200px;
  padding: 1em;
}

header {
  grid-column: 1 / -1;
  text-align: center;
}

main {
  padding: 1em;
  box-shadow: 0 4px 6px;
  border-radius: 8px;
  box-sizing: border-box;
  margin: auto;
  max-width: 800px;
  width: calc(100% - 4em);
}

label {
  display: block;
  margin: 1em 0 0.5em;
  font-weight: bold;
}

select {
  width: 100%;
  padding: 1em;
  margin-bottom: 1em;
  border: 1px solid;
  border-radius: 5px;
}

.instructions {
  margin-top: 2em;
  padding: 1em;
  border-left: 5px solid;
  border-radius: 4px;
}

.instructions.hidden {
  display: none;
}

footer {
  grid-column: 1 / -1;
  text-align: center;
  margin-top: 2em;
}

.footer-links a {
  text-decoration: none;
  margin: 0 1em;
}

.main-placeholder {
  padding: 1em;
  border-style: double;
  text-align: center;
  max-width: 768px;
  height: 90px;
}

.sidebar-placeholder {
  border-style: double;
  text-align: center;
  width: 160px;
  height: 600px;
}

@media (max-width: 750px) {
  .container {
    grid-template-columns: 1fr;
  }

  .sidebar-placeholder {
    display: none;
  }

  main {
    width: calc(100% - 1em);
  }
}