.checkbox {
  appearance: none;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 3px;
  background-color: var(--color-background); 
  cursor: pointer;
  
  border: 1px solid var(--color-border);
  display: grid;
  place-content: center;
  margin-right: 0.3rem;
}

.checkbox::before {
  content: "";
  width: 0.65em;
  height: 0.65em;
  transform: scale(0);
  transition: 120ms transform ease-in-out;
  box-shadow: inset 1em 1em var(--color-background); 
  
  transform-origin: center;
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}

.checkbox:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.checkbox:checked::before {
  transform: scale(1);
}