* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: grid;
  grid-template-rows: -webkit-min-content 1fr -webkit-min-content;
  grid-template-rows: min-content 1fr min-content;
  font-family: "Inconsolata", monospace;
  font-weight: bold;
  letter-spacing: 0.03em;
  font-size: 1.25rem;
  line-height: 1;
}

nav {
  background-color: #a8a8a8;
}
nav ul {
  list-style: none;
  margin: 0;
  padding: 0.15rem 2rem;
  display: flex;
}
nav ul li + li {
  margin-left: 1rem;
}
nav ul li:last-child {
  margin-left: auto;
}

main {
  background-color: #0b00a8;
  color: #a8a8a8;
  padding: 1.25rem 1rem;
  box-shadow: inset 0 0 0 7px #0b00a8, inset 0 0 0 9px currentcolor;
  position: relative;
}
main:focus {
  outline: none;
}
main:before {
  content: "HELLOWORLD.BAT";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  background-color: #a8a8a8;
  color: #0b00a8;
  padding: 0 0.75rem;
}
main span {
  display: inline-flex;
}

footer {
  background-color: #00a7a8;
  color: #fff;
  padding: 0.05rem 1rem;
  display: flex;
}
footer span {
  margin-left: 2rem;
}

.cursor:after {
  content: "";
  display: inline-block;
  width: 1ch;
  height: 1.1em;
  background-color: #0b00a8;
  margin: -0.03em 0 -0.03em -0.03em;
}

.cursor.active:after {
  -webkit-animation: cursor 400ms ease-in-out infinite;
          animation: cursor 400ms ease-in-out infinite;
}

@-webkit-keyframes cursor {
  0%, 100% {
    background-color: #0b00a8;
  }
  50% {
    background-color: #a8a8a8;
  }
}

@keyframes cursor {
  0%, 100% {
    background-color: #0b00a8;
  }
  50% {
    background-color: #a8a8a8;
  }
}