<form>  
  <label>
    <input type="checkbox">
    we need to target this when input is checked
  </label>
</form>

label:has(input:checked) {
  color: green;
  text-decoration: line-through;
}

body {    
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;  
  flex-wrap: wrap;
  gap: 2rem;  
  min-height: 100vh;
  margin: 0;
  padding: 1rem;
  color: #333;
  font-family: 'Roboto', sans-serif;
  background-color: #eee;
}