[type="checkbox"]:not(:checked),
[type="checkbox"]:checked {
  position: absolute;
  left: -9999px;
}
[type="checkbox"]:not(:checked) + label,
[type="checkbox"]:checked + label {
  position: relative;
  padding-left: 25px;
  cursor: pointer;
}

/* checkbox aspect */
[type="checkbox"]:not(:checked) + label:before,
[type="checkbox"]:checked + label:before {
  content: '';
  position: absolute;
  left:0; top: 2px;
  width: 17px; height: 17px;
  border: 1px solid #aaa;
  background: #f8f8f8;
  border-radius: 0px;
  box-shadow: inset 0 1px 3px rgba(0,0,0,.3)
}
/* checked mark aspect */
[type="checkbox"]:not(:checked) + label:after,
[type="checkbox"]:checked + label:after {
  content: '\2713';
  position: absolute;
  top: 3px; left: 4px;
  font-size: 18px;
  line-height: 0.8;
  color: #09ad7e;
  transition: all .2s;
}
/* checked mark aspect changes */
[type="checkbox"]:not(:checked) + label:after {
  opacity: 0;
  transform: scale(0);
}
[type="checkbox"]:checked + label:after {
  opacity: 1;
  transform: scale(1);
}
/* disabled checkbox */
[type="checkbox"]:disabled:not(:checked) + label:before,
[type="checkbox"]:disabled:checked + label:before {
  box-shadow: none;
  border-color: #000;
  background-color: #fff;
}
[type="checkbox"]:disabled:checked + label:after {
  color: #999;
}
[type="checkbox"]:disabled + label {
  color: #aaa;
}
/* accessibility */
[type="checkbox"]:checked:focus + label:before,
[type="checkbox"]:not(:checked):focus + label:before {
  border: 1px solid #000;
}

/* hover style just for information */
label:hover:before {
  border: 1px solid #000!important;
}