style.css

:root {
  --display-none: none;
  --display-new-none: none;
  --display-slider-none: none;
  --visualiser-bar: 0%;
  --upper-hr-bottom: 0%;
  --lower-hr-bottom: 0%;
  --medal-opacity: 30%;
  --display-slider: block;
}
*, ::before, ::after {
  font-family: "PressStart2P", sans-serif;
  font-size: .85em;
  margin: 0;
  padding: 0;
  user-select: none;
}
/* Google Font van: https://fonts.google.com/specimen/Press+Start+2P?preview.text=SCORE:%20120!!!&preview.text_type=custom */
@font-face {
  font-family: "PressStart2P";
  src: url(./Fonts/PressStart2P-Regular.ttf);
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
body {
  background-image: linear-gradient(to right, #f6fbff, #fff3ea);
}

/* =======-----===== Main code styling =====-----======= */

/* background image van: https://www.reddit.com/r/wallpaper/comments/bm3u8v/pixel_art_1920_x_1080/ */
canvas {
  display: block;
  background-image: url(./Images/8bit-background.png);
  background-size: 140%;
  background-position-y: -5em;
  border: 1px solid black;
}
.game-container {
  position: relative;
}
/* =======----- Gameover popup screen -----======= */
.gameover-message {
  position: absolute;
  font-size: 2em;
  top: 150px;
  left: 50%;
  width: 40%;
  height: 30%;
  transform: translateX(-50%);
  display: var(--display-none);
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  grid-template-areas: 
    "medal score"
    "medal best";
  text-align: center;
  z-index: 1;
  background-color: #6c8099;
  color: #fff;
  padding: 2em;
  border: 3px solid #fff3ea;
  border-radius: .75em;
}
.gameover-message > p {
  color: #fff8f0;
}
.gameover-message p:nth-of-type(1) {
  grid-area: medal;
  text-align: left;
}
.gameover-message img:nth-of-type(2) {
  position: relative;
  grid-area: medal;
  width: 5em;
  top: 3em;
  opacity: var(--medal-opacity);
}
.gameover-message p:nth-of-type(2) {
  grid-area: score;
  text-align: right;
}
.current-score {
  position: relative;
  top: .4em;
  font-size: 2em;
  color: white;
}
.best-score {
  position: relative;
  top: .4em;
  font-size: 2em;
  color: white;
}
.gameover-message h2 {
  grid-area: best;
  position: absolute;
  left: 2.2em;
  top: -.15em;
  font-size: .8em;
  font: 100;
  padding: .2em;
  background-color: red;
  display: var(--display-new-none);
}
.gameover-message p:nth-of-type(3) {
  grid-area: best;
  text-align: right;
}
.gameover-message img:first-of-type {
  position: absolute;
  width: 22em;
  top: -7em;
  margin-left: 2.5em;
  filter: hue-rotate(0.54turn) saturate(75%);
}

.gameover-message button {
  position: absolute;
  margin-left: 50%;
  transform: translateX(-50%);
  bottom: -7em;
  width: 10em;
  height: 4.5em;
  border-radius: .5em;
  background-color: #fff3ea;
  color: #334760
}

.gameover-message {
  display: none;
}

.gameover-show {
  display: grid !important;
}
/* =======-----=====------=====-----======= */

/* =======-----=====-------------=====-----======= */

/* =======-----===== Visualiser voor audio =====-----======= */
.level-visualizer {
  background-color: #93a0af;
  position: absolute;
  width: 100px;
  height: 518px;
  right: 18em;
  top: 50%;
  transform: translate(-50%, -50%);
  left: 50%;
  display: flex;
  align-items: end;
  margin-left: 53em;
}

.Microphone {
  position: absolute;
  width: 3em;
  margin-top: 61em;
  margin-left: 106em;
}
.left-microphone {
  margin-left: -106em !important;
}
.left-position {
  margin-left: -53em !important;
}
.inner-visualizer-bar {
  height: var(--visualiser-bar);
  width: 100%;
  background-color: #334760;
}

.upper-slider {
  position: absolute;
  width: 90%;
  color: white;
  border: 5px solid white;
  bottom: var(--upper-hr-bottom);
  display: var( --display-slider-none);
  border-color: rgb(113, 210, 44);
}
.lower-slider {
  position: absolute;
  width: 90%;
  color: white;
  border: 5px solid white;
  bottom: var(--lower-hr-bottom);
  display: var( --display-slider-none);
  border-color: rgb(236, 101, 80);
}

.ThresholdUpper {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  left: 50%;
  margin-left: 67em;
  margin-top: 20em;
  display: var(--display-slider);
  accent-color: rgb(113, 210, 44);
}

.ThresholdLower {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  left: 50%;
  margin-left: 67em;
  margin-top: 24em;
  display: var(--display-slider);
  accent-color: rgb(236, 101, 80);
}
/* =======-----=====-------------=====-----======= */

/* =======----- Button fix audio -----======= */
.audio-button {
  position: absolute;
  bottom: 5em;
  background-color: #334760;
  margin: 10px;
  padding: 15px 45px;
  text-align: center;
  color: white;            
  box-shadow: 0 0 20px #eee;
  border-radius: 10px;
}
/* =======-----=====------=====-----======= */

/* =======-----===== Slider toggle modes =====-----======= */
.slider-container {
  position: absolute;
  top: 2em;
  display: flex;
  width: 40em;
  justify-content: space-between;
  align-items: center;
  font-size: 1.5em;
}

.slider-container h2:nth-of-type(1) {
  color: #334760;
}
.slider-container h2:nth-of-type(2) {
  color: #2196F3;
}
.toggle-slider {
  position: relative;
  top: 0;
  left: 0;
  width: 60px;
  height: 34px;
}

.toggle-slider input {
  display: none;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #334760;
  -webkit-transition: .4s;
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #2196F3;
}

input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  transform: translateX(26px);
}
/* =======-----=====-------------=====-----======= */