style.css

nav ul {
  align-items: start;
}

nav button svg {
  display: block;
}

h1 {
  font-size: 2.5em;
}

h2 {
  font-size: 2.1em;
}

h1, h2 {
  text-align: center;
  text-shadow: 0.08em 0.06em #8888;
}

h1 img,
h2 img {
  background-color: currentColor;
  border-radius: 100%;
  background-origin: content-box;
  padding: 0;
  height: 0.75em;
  vertical-align: baseline;
  filter: drop-shadow(0.08em 0.06em #8888);
}

label.option {
  display: flex;
  align-items: baseline;
  gap: 1em;
  width: 100%;;
}

label.option * {
  width: auto;
}

[type="checkbox"][role="switch"] {
  margin: 0;
}

#grille {
  width: fit-content;
  margin: auto;
}

input.lettre {
  font-size: 1.6em;
  font-weight: bold;
  text-transform: capitalize;
  width: 1.5em;
  height: 1.5em;
  padding: 0.15em;
  text-align: center;
  border-radius: 0.3rem;
  vertical-align: text-top;
}

input.bien-placee {
  background-color: #D93526D0;
}

input.mal-placee {
  background-image: radial-gradient(ellipse at center, #FFBF00A0 70%, transparent 70%);
  background-repeat: no-repeat;
}

input.lettre:disabled {
  opacity: 100%;
}