[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: 20px;
  height: 20px;
  border: 1px solid #aaa;
  background:none;
  
}

/* checked mark aspect */

[type="checkbox"]:not(:checked) + label:after,
[type="checkbox"]:checked + label:after {
  content: '✔';
  position: absolute;
  top: 5px;
  left: 4px;
  font-size: 14px;
  color:#000 !important;
  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: #bbb;
  background-color: #ddd;
}

[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 dotted blue;
}
/* hover style just for information */

label:hover:before {
  border: 1px solid #4778d9!important;
}