*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: #1565d8;
}

/* wallpaper: "Computer Nature City 01 (Practical Design)" by 아사달 (Asadal), CC BY 4.0
   https://commons.wikimedia.org/wiki/File:Computer_Nature_City_01_(Practical_Design).jpg */
body {
  margin: 0;
  min-height: 100vh;
  background: #1565d8 url("/img/frutiger-aero.jpg?v=4") center / cover no-repeat fixed;
}

img {
  max-width: 100%;
  display: block;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.title-bar-text {
  margin: 0;
}

/* 98.css's pixel font is only sharp at 11px, so use a regular font to go bigger */
main .window,
main .window * {
  font-family: Tahoma, Verdana, Arial, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: auto;
}

p {
  margin: 0;
}

ul.tree-view a {
  color: #00f;
  text-decoration: underline;
  cursor: pointer;
}

ul.tree-view a:hover,
ul.tree-view a:focus {
  background-color: navy;
  color: #fff;
}