input[type=checkbox].checkboxCustom + label {
  display: block;
  margin: 0.2em;
  cursor: pointer;
  padding: 0.2em;
}

input[type=checkbox].checkboxCustom {
  display: none;
}

input[type=checkbox].checkboxCustom + label:before {
  content: "\2714";
  border: 0.1em solid #000;
  border-radius: 0.2em;
  display: inline-block;
  width: 1em;
  height: 1em;
  padding-left: 0.2em;
  padding-bottom: 0.3em;
  margin-right: 0.2em;
  vertical-align: bottom;
  color: transparent;
  transition: .2s;
}

input[type=checkbox].checkboxCustom + label:active:before {
  transform: scale(0);
}

input[type=checkbox].checkboxCustom:checked + label:before {
  background-color: #2e76ff;
  border-color: #2e76ff;
  color: #fff;
}

input[type=checkbox].checkboxCustom:disabled + label:before {
  transform: scale(1);
  border-color: #aaa;
}

input[type=checkbox].checkboxCustom:checked:disabled + label:before {
  transform: scale(1);
  background-color: #669cff;
  border-color: #669cff;
}