:root {
  font-size: 62.5%;
  --color: #323238;
  --text-color: #323238;
  --body-color: #ffffff;
  --primary-color: #323238;
  --moodbtn-color: #E1E1E6;
  --moodbtn-color-sec: #02799D;
  --moodbtn-icon-color: #ffffff;
  --hoverctrl-color: rgb(221, 8, 8);
  --slider-color1: var(--color);
  --slider-color2: var(--color);
  --slider-color3: var(--color);
  --slider-color4: var(--color);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  color: var(--text-color);
  display: grid;
  place-items: center;
  height: 100vh;
  background-color: var(--body-color);

}

main {
  margin-top: -4rem;
  display: flex;
  align-items: center;
  gap: 19.2rem;
}

.controls {
  display: flex;
  justify-content: space-between;
}

.sounds-display {
  display: grid;
  grid-template-areas:
    'A B'
    'C D';
  gap: 3.2rem;
}

.hide {
  display: none;
}

h1 {
  font-family: 'Roboto', sans-serif;
  font-weight: 500;
  font-size: 12.6rem;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

svg path,
svg rect {
  transition: fill ease 0.2s
}

.controls button:hover>svg path,
.controls button:hover>svg rect {
  fill: var(--hoverctrl-color);
}

button svg path,
button svg rect {
  fill: var(--primary-color);
}

.sounds-display .button {
  height: 15.2rem;
  width: 13.8rem;

  background-color: var(--moodbtn-color);

  display: flex;
  flex-direction: column;

  border-radius: 2rem;
  text-align: center;

  position: relative;
}

.button button {
  width: 100%;
  height: 100%;

  border-radius: 2rem;
  transition: background ease 0.2s;
}

.button button svg {
  margin-bottom: 3.2rem;
}

.slider {
  position: absolute;
  bottom: 2.4rem;
  left: 50%;
  transform: translateX(-50%);
  width: 9rem;
  height: .4rem;
  border-radius: .5rem;
  -webkit-appearance: none;
  background-color: var(--text-color);
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  border-radius: 50%;
  width: 1.6rem;
  height: 1.6rem;
  cursor: pointer;
}

#forest-volume::-webkit-slider-thumb {
  background-color: var(--slider-color1);
}

#rain-volume::-webkit-slider-thumb {
  background-color: var(--slider-color2);
}

#coffee-volume::-webkit-slider-thumb {
  background-color: var(--slider-color3);
}

#fireplace-volume::-webkit-slider-thumb {
  background-color: var(--slider-color4);
}

.slider:hover~.button {
  background-color: var(--moodbtn-color-sec);
}

.light,
.dark {
  position: absolute;
  right: 3.5rem;
  top: 2.5rem;
}