style.css

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: sans-serif;
  background-color: black;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  position: absolute;
  z-index: 0;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.menu {
  border: 1px solid currentcolor;
  position: relative;
  z-index: 1;
  background-color: rgba(0, 0, 0, 0.75);
  display: none;
  min-width: 480px;
  max-width: 640px;
  max-height: 90vh;
  overflow-y: auto;
}

h1 {
  position: sticky;
  top: 0;
  margin: 0;
  padding: 1rem;
  background-color: black;
  border-bottom: 1px solid currentcolor;
}

section {
  padding: 0 1rem;
}

#gallery:not(.dont-move) {
  transition: translate 1s ease-out;
}

#gallery img {
  border: 4px solid gold;
  margin: 8px;
  animation: 1s ease-out ooh-shiny;
}

body > #gallery {
  position: absolute;
  left: 24px;
  top: 24px;
}

body > #gallery img {
  width: 24px;
  height: 32px;
  border-width: 2px;
}

.menu .button-row {
  padding: 1rem;
  position: sticky;
  bottom: 0;
  background-color: black;
  border-top: 1px solid currentcolor;
}

body.main-menu #main-menu {
  display: block;
}

body.paused #paused {
  display: block;
}

body.how-to-play #how-to-play {
  display: block;
}

body.game-over #game-over {
  display: block;
}

.button-row {
  display: flex;
  flex-direction: row;
  gap: 1rem;
}

.button-row button {
  flex: 1 1 1px;
}

.danger {
  color: #FF8888;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th {
  font-weight: inherit;
}

tbody th {
  text-align: right;
}

td {
  text-align: center;
  white-space: nowrap;
}

tbody th, tbody td {
  border-top: 1px solid rgba(255, 255, 255, 0.5);
}


th, td {
  padding: 1rem;
}

kbd, joystick-button, joystick-trigger, joystick-direction {
  font-size: 1rem;
  border: 1px solid currentcolor;
  display: inline-block;
  min-width: 2em;
  height: 2em;
  line-height: 2em;
}

joystick-button, joystick-direction {
  border-radius: 50%;
}

joystick-trigger {
  border-radius: 0 0 25% 25%;
}

button {
  color: inherit;
  font-size: inherit;
  border: 2px solid white;
  background-color: black;
  border-radius: 4px;
}

@keyframes focused {
  from {
    box-shadow: 0px 0px 8px 4px white;
  }

  to {
    box-shadow: 0px 0px 4px 4px cyan;
  }
}

@keyframes ooh-shiny {
  from {
    box-shadow: 0px 0px 64px 8px white;
  }
  
  to {
    box-shadow: 0px 0px 0px 0px white;
  }
}

button:focus {
  outline: none;
  animation: 1s ease-out infinite alternate focused;
}