* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  color: black;
  background-color: white;
}

nav {
  width: 100%;
  position: absolute;
  display: flex;
  flex-wrap: wrap;
  align-items: left;
  justify-content: left;
  padding: 0.5rem;
  gap: 0.5rem;
  border-bottom: solid 1px #aaa;
  background-color: #eee;
}

nav a {
  display: inline-block;
  min-width: 9rem;
  padding: 0.5rem;
  border-radius: 0.2rem;
  border: solid 1px #aaa;
  text-align: center;
  text-decoration: none;
  color: #555;
}

nav a[aria-current='page'] {
  color: #000;
  background-color: #d4d4d4;
}

main {
  padding: 3rem;
}

h1 {
  font-weight: bold;
  font-size: 1.5rem;
}

#container {
  width: 100%;
  height: 100vh;
  border: 1px solid black;
  display: flex;
}

#container div {
  -ms-flex: 1;
  flex: 1;
}

div .left-col {
  background-color: #555;
  max-width: 20vw;
}
div .right-col {
  background-color: rgb(28, 150, 167);
}
div .middle-col {
  background-color: rgb(179, 34, 34);
}

.hidden {
  display: none;
  overflow: hidden;
}