:root {
  --bg: #202020;
  --a_color: #303030;
  --a_hover_color: #353535;

  --font_color: green;
  --font_family: monospace;
  --font_spacing: 2px;

  --animation_speed: 0.5s;
}

a {
  text-decoration: none;
  color: var(--font_color);
  cursor: pointer;
}

body {
  background-color: var(--bg);
  color: var(--font_color);
  letter-spacing: var(--font_spacing);

  font-family: var(--font_family);
}

#app {
  width: 80%;

  margin-top: 30px;
  margin-left: auto;
  margin-right: auto;
}

#navigation {
  width: 100%;
  display: flex;
  justify-content: space-around;
}

#content {
  width: 100%;
  height: 400px;
  /* letter-spacing: var(--font_spacing); */
}

#content h1:first-letter {
  text-transform: capitalize;
}

#navigation a {
  background-color: var(--a_color);
  width: 31%;
  padding: 1%;
  margin: 10px;

  text-decoration: none;
  color: var(--font_color);
  text-align: center;

  transition: background-color var(--animation_speed);
}

#navigation a:hover {
  background-color: var(--a_hover_color);
}

cursor {
  animation: blink 0.5s infinite;
  animation-direction: alternate-reverse;

  color: white;
}

@keyframes blink {
  from { opacity: 1; }
  to { opacity: 0; }
}

.sidebar {
  width: 150px;
  height: 400px;
  margin-right: 10px;
  float: left;
}

img {
  width: 100%;
}

li {
  padding: 10px;
}