CSS Customized Checkbox

Ref:
http://jsbin.com/nobelofatu/1/edit

#todo-list li .toggle {
  text-align: center;
  width: 40px;
  /* auto, since non-WebKit browsers doesn't support input styling */
  height: auto;
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
  border: none; /* Mobile Safari */
  -webkit-appearance: none;
  /*-moz-appearance: none;*/
  -ms-appearance: none;
  -o-appearance: none;
  appearance: none;
}

#todo-list li .toggle:after {
  content: '✔';
  line-height: 43px; /* 40 + a couple of pixels visual adjustment */
  font-size: 20px;
  color: #d9d9d9;
  text-shadow: 0 -1px 0 #bfbfbf;
}

#todo-list li .toggle:checked:after {
  color: red;
  text-shadow: 0 1px 0 #669991;
  bottom: 1px;
  position: relative;
}

## Todo: add pic
A jsfiddle example