.formask-checkbox .checkbox {
    position: relative;
    padding-left: 20px;
    margin-right: 50px;
}
.formask-checkbox .checkbox {
    padding-left: 25px;
}

.formask-checkbox .checkbox:after {
  cursor: pointer;
  content: '';
  background-color: #FFF;
  border: 1px #ccc solid;
  box-sizing: border-box;
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  transition: 0.2s linear;
}
.formask-checkbox .checkbox:after {
  content: 'v';
  width: 20px;
  height: 20px;
  font-size: 11px;
  text-align: center;
  text-indent: 0px;
  line-height: 21px;
  color: transparent;
  border-radius: 3px;
  margin-right: 3px;
}

input[type="checkbox"]:checked + .checkbox:after {
  border: 1px #01b1f0 solid;
  background-color: #01b1f0;
  color: #fff;
}