body, html {
  margin: 0;
  overflow: hidden;
  height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  background: #6e6e6e;
}

#game {
  background: #111;
  position: absolute;
  display: none;
  border: 1px solid #222222;
  border-radius: 2px;
  font-size: 16px;
  color: #f4f4f4;
  text-align: center;
  -webkit-box-shadow: 0 0 10px #000;
     -moz-box-shadow: 0 0 10px #000;
       -o-box-shadow: 0 0 10px #000;
          box-shadow: 0 0 10px #000;
}

#canvas {
  position: absolute;
  top: 0;
  left: 0;
}

#menu {
  position: absolute;
  display: none;
  width: 320px;
  height: 320px;
}

#menu h1 {
  font-size: 38px;
  text-align: center;
  letter-spacing: 2px;
}

#menu section {
  display: none;
  font-size: 14px;
  padding: 4px;
  width: 320px;
  border-radius: 8px;
}

#menu h2 {
  font-size: 16px;
}

#menu .welcome {
  display: inline-block;
}

#score {
  display: none;
  font-weight: bold;
  font-size: 18px;
}

#score p {
  color: rgba(100,240,255);
  font-size: 24px;
}

#highscore {
  display: none;
  font-weight: bold;
  font-size: 18px;
}

#highscore p {
  color: rgba(255, 255, 100);
  font-size: 24px;
}

/* side by side div */
.container {
  display: flex;
}

.fixed {
  width: 200px;
}

.flex-item {
  flex-grow: 1;
}

.button {
  box-shadow:inset 0px 1px 3px 0px #91b8b3;
  background:linear-gradient(to bottom, #768d87 5%, #6c7c7c 100%);
  background-color:#768d87;
  border-radius:5px;
  border:1px solid #566963;
  display:none;
  cursor:pointer;
  color:#ffffff;
  font-size:28px;
  font-weight:bold;
  padding:4px;
  text-decoration:none;
  text-shadow:0px -1px 0px #2b665e;
  outline: none;
}

.button:hover {
  background:linear-gradient(to bottom, #6c7c7c 5%, #768d87 100%);
  background-color:#6c7c7c;
}

.button:active {
  transform: scale(0.9);
}

#soundButton {
  display: inline-block;
  padding: 4px;
  margin: 4px;
  width: 28px;
  font-size:18px;
}

.disable-select {
  user-select: none; /* supported by Chrome and Opera */
 -webkit-user-select: none; /* Safari */
 -khtml-user-select: none; /* Konqueror HTML */
 -moz-user-select: none; /* Firefox */
 -ms-user-select: none; /* Internet Explorer/Edge */
}

.loader {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: none;
  border-top: 3px solid #FFF;
  border-right: 3px solid transparent;
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
  position: absolute;
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}