.checkbox {
  position: relative;
  display: inline-block;
  width: 28px;
  height: 28px;
  border: 2px solid var(--color-primary);
  -webkit-appearance: none;
  appearance: none;
  background-color: var(--color-background);
  border-radius: var(--border-radius-full);
}

.checkbox:checked::after {
  position: absolute;
  top: 0;
  left: 5px;
  color: var(--color-primary);
  content: '\2714';
  font-size: 18px;
}