.custom-checkbox {
  display: inline-block;
  margin-right: 10px;
  vertical-align: middle;
}
.custom-checkbox input {
  display: none;
}
.custom-checkbox__indicator {
  border: 2px solid white;
  height: 25px;
  position: relative;
  width: 25px;
}
.custom-checkbox__indicator:before {
  bottom: 0;
  color: white;
  content: '\2713';
  font-size: 14px;
  font-weight: bold;
  left: 0;
  line-height: 25px;
  opacity: 0;
  margin: auto;
  position: absolute;
  right: 0;
  text-align: center;
  top: -1px;
  transition: opacity 0.2s ease-in-out;
}

.custom-checkbox.is-checked .custom-checkbox__indicator:before {
  opacity: 1;
}