style.scss

.container {
  background: #222;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
  font-family: sans-serif;
  color: #fff;
  font-size: 1rem;

  a {
    color: #dede44;

    &:hover {
      color: #dede22;
    }
  }

  canvas {
    image-rendering: auto;
  }

  button {
    appearance: none;
    padding: 0.5rem;
    border: 0;
    background: #fff;
    width: 100px;
    text-align: center;
    cursor: pointer;
  }
 

  .hidden {
    opacity: 0;
  }

  .actions,
  .controls {
    transition: opacity 0.3s ease, background-color 0.3s ease;
    opacity: 0.2;
    position: fixed;
    background-color: transparent;
    display: flex;
    padding: 1rem 0;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;

    &:hover {
      opacity: 1;
      background-color: rgba(0,0,0,0.5)
    }
  }

  .actions {
    bottom: 0;
    text-align: center;
    flex-direction: column;

    p {
      margin: 1rem 0;
      padding: 0 1rem;
      font-size: 0.8rem;
      
      &:last-child  {
        margin-bottom: 0;
      }
    }
  }

  .controls {
    top: 0;
    flex-direction: row;

    &__title {
      text-align: center;
      width: 100%;
      margin-top: 0.5rem;

      small {
        font-size: 0.8rem;
      }
    }
  }

  .control {
    display: flex;
    flex-direction: column;
    color: #fff;
    margin: 0.5rem;
    width: auto;

    &__label {
      margin-bottom: 0.2rem;
      width: 100%;
    }

    &__input {
      width: 100%;
      cursor: pointer;
      margin: 0;
    }

    &__value {
      font-weight: bold;
    }
  }
}