style.css

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@900&display=swap");

* {
  font-family: "Inter", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
*:focus-visible {
  outline: none;
}

body {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
  margin-top: 1rem;
}

h1 {
  display: flex;
  justify-content: center;
  text-align: center;
}

button {
  padding: 0.6rem 2rem;
  border-radius: 0.75rem;
  border: none;
  background-color: #0070f3;
  color: white;
  letter-spacing: 0.05rem;
  margin: 1rem;
  box-shadow: 0 0 10px 0 #0071f39c;
  transition: 200ms ease;
}
button:hover {
  background-color: #0071f3ec;
}

.container {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  margin-bottom: 5vh;
}

.controller {
  display: flex;
  flex-direction: column;
  margin-bottom: 5vw;
}

.size {
  display: flex;
  margin-top: 1rem;
}

input[type="range"] {
  appearance: none;
  margin-left: 1rem;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  border: 1px solid #0070f3;
  height: 1rem;
  width: 1rem;
  border-radius: 25px;
  background: white;
  cursor: pointer;
  margin-top: -0.37rem;
}
input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 2px 0 #0070f3;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 0.3rem;
  cursor: pointer;
  background: #0070f3;
  border-radius: 10px;
}

@media only screen and (max-width: 770px) {
  .container {
    flex-direction: column-reverse;
  }
  body {
    padding-top: 6rem;
  }
}

@media only screen and (max-width: 510px) {
  #mycanvas {
    width: 85vw;
    height: 85vw;
  }
  body {
    padding-top: 3rem;
  }
}