style.css

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

html {
  font-size: 62.5%;
  box-sizing: border-box;
  font-family: "Roboto", serif;
}

body {
  font-size: 1.6rem;
}

:root {
  --white: #eee;
  --black: #333;
}

/* ------------------ Basic ------------------ */

body {
  width: 100vw;
  max-width: 100%;
  height: 100vh;

  background-color: var(--white);

  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

canvas {
  display: block;

  border-radius: 0.5rem;
}

/* ------------------ header ------------------ */

.header {
  height: 8rem;
  padding: 1rem;
}

.header__title {
  font-size: 4rem;
  color: var(--black);
}

/* ------------------ main ------------------ */

.main {
  flex: 1;

  display: flex;
  justify-content: center;
  align-items: center;

  gap: 3rem;
}

/* ------------------ controls ------------------ */

.controls {
  padding: 2rem 0;
  height: 100%;

  display: flex;
  flex-direction: column;
  gap: 1rem;

  color: var(--black);
}

.controls__title {
  font-size: 2.4rem;
}

.controls__label {
  font-size: 1.4rem;
  display: block;
  margin-bottom: 0.7rem;

  display: flex;
  gap: 1rem;
  user-select: none;
}

.control__slider-container {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.controls__button {
  min-width: 8rem;
  font-size: 1.4rem;
  padding: 0.5rem 2rem;
  border: none;
  border-radius: 0.5rem;
  background-color: var(--black);
  color: var(--white);
  cursor: pointer;
  user-select: none;
}

.controls__button:hover {
  background-color: #000;
}

.controls__button a {
  color: var(--white);
  text-decoration: none;
}