@font-face {
  font-family: Scientifica;
  src: url(fonts/scientifica-bold.woff2);
  font-weight: 700;
}

@font-face {
  font-family: NerdFontsSymbols;
  src: url(fonts/nerd-icons.woff2);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 12px;
  background: teal;
  font: 14px/1.5 Tahoma, sans-serif;
}

main,
.btn {
  background: silver;
  border: 2px solid;
  border-color: #fff #444 #444 #fff;
}

main {
  width: min(100%, 400px);
}

.titlebar {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 24px;
  padding: 0 2px 0 4px;
  background: navy;
  color: #fff;
  border-bottom: 1px solid #000;
  font: 700 12px/1 Tahoma, sans-serif;
}

.titlebar > div {
  display: flex;
  gap: 2px;
  margin-left: auto;
}

.btn {
  border-radius: 0;
  text-decoration: none;
  color: #000;
}

.btn:active {
  border-color: #444 #fff #fff #444;
  padding: 2px 0 0 2px; 
}

.btn:focus-visible {
  outline: 1px dotted;
}

.ctrl,
nav a {
  display: grid;
  place-items: center;
}

.ctrl {
  width: 18px;
  height: 16px;
  padding: 0;
  font: 12px/1 Tahoma, sans-serif;
}

.content {
  padding: 20px 18px;
}

header {
  display: flex;
  align-items: center;
  gap: 14px;
}

header img {
  flex: none;
  width: 68px;
  height: 68px;
  border: 2px solid;
  border-color: #444 #fff #fff #444;
}

header p {
  margin: 5px 0 0;
  color: #444;
  font-size: 12px;
}

h1 {
  margin: 0;
  font: 700 32px/1 Scientifica, monospace;
}

.normal-text {
  margin: 20px 0 0;
}

nav {
  display: flex;
  gap: 8px;
  margin-top: 24px;
}

nav a {
  width: 44px;
  height: 44px;
  color: navy;
  font: 700 16px Tahoma, sans-serif;
}

nav a:not(:last-child) {
  font: 20px/1 NerdFontsSymbols;
}