puzzle/game/style.css

:root {
  --main-color: #c1b19f;
  --link-color: #808db0;
  --link-hover-color: #c5cfeb;
  --highlight-color: #dd7e7e;
  --input-bg-color: #262523;
  --bg-color: rgba(0,0,0,.7);
}

html,
body {
  margin: 0;
  background: #2b2b2b;
  color: var(--main-color);
  height: 100%;
  font-family: sans-serif;
}

a { color: var(--link-color); text-decoration: none; }
a:hover { color: var(--link-hover-color); }

.scores {
  position: absolute;
  right: 0;

  background: var(--bg-color);
  padding: 5px;
  border: solid 1px black;
  box-shadow: 0 0 10px 0 rgba(0,0,0,.7);
}

.timer {
  position: absolute;
  left: 0;

  background: var(--bg-color);
  padding: 5px;
  border: solid 1px black;
  box-shadow: 0 0 10px 0 rgba(0,0,0,.7);
}

.menu {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-color);
  padding: 5px;
  border: solid 1px black;
  box-shadow: 0 0 10px 0 rgba(0,0,0,.7);
  z-index: 2;
}

.closed {
  display: none;
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  background: var(--bg-color);
}

.overlay.transparent {
  background: transparent;
}

.settings {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  background: var(--bg-color);
  padding: 5px;
  border: solid 1px black;
  box-shadow: 0 0 10px 0 rgba(0,0,0,.7);
  z-index: 1;
}

.preview {
  position: absolute;
  top: 20px;
  left: 20px;
  bottom: 20px;
  right: 20px;
}

.preview .img {
  height: 100%;
  width: 100%;
  position: absolute;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

.menu .opener {
  display: inline-block;
  margin-right: 10px;
  color: var(--link-color);
}

.menu .opener:last-child {
  margin-right: 0;
}

.menu .opener:hover {
  color: var(--link-hover-color);
  cursor: pointer;
}

canvas {
  cursor: none;
}

input {
  background: #333230;
  border-radius: 4px;
  color: var(--main-color);
  padding: 6px 10px;
  border: solid 1px black;
  box-shadow: 0 0 3px rgba(0, 0,0,0.3) inset;
}

input:focus {
  border: solid 1px #686767;
  background: var(--input-bg-color);
}

.btn {
  font: 15px sans-serif;
  display: inline-block;
  background: var(--input-bg-color);
  color: var(--link-color);
  border: solid 1px black;
  padding: 5px 10px;
  box-shadow: 1px 1px 2px rgba(0,0,0,.5), 0 0 1px rgba(150,150,150,.4) inset;
  border-radius: 4px;
  user-select: none;
}

.btn:hover {
  background: #2f2e2c;
  color: var(--link-hover-color);
  border: solid 1px #111;
  box-shadow: 0 0 1px rgba(150,150,150,.4) inset;
  cursor: pointer;
}

.btn:disabled {
  background: #2f2e2c;
  color: #8c4747 !important;
  border: solid 1px #111;
  box-shadow: 0 0 1px rgba(150,150,150,.4) inset;
  cursor: not-allowed;
}

.game-teaser-wrap {
  display: inline-block;
  width: 20%;
  padding: 5px;
  box-sizing: border-box;
}

.game-teaser {
  display: block;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  position: relative;
  padding-top: 56.25%;
  width: 100%;
  background-color: #222222;
}

.game-info {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
}

.game-info-text {
  position: absolute;
  top: 0;
  background: var(--bg-color);
  padding: 5px;
}