How to fix checkboxes and radiobuttons display on iOS devices?

They work great on PC, Mac OS and Android, but look checked/wrong on iOS devices - see images below. Live example - http://ift.tt/2qvNY3X.

Checkbox related CSS:

.checkbox input[type=checkbox] {
  opacity: 0;
  position: absolute;
  margin: 0;
  z-index: -1;
  width: 0;
  height: 0;
  overflow: hidden;
  left: 0;
  pointer-events: none;
}
.checkbox .checkbox-material {
  vertical-align: middle;
  position: relative;
  top: 3px;
  padding-right: 5px;
}
.checkbox .checkbox-material:before {
  display: block;
  position: absolute;
  left: 0;
  content: "";
  background-color: rgba(0, 0, 0, 0.84);
  height: 20px;
  width: 20px;
  border-radius: 100%;
  z-index: 1;
  opacity: 0;
  margin: 0;
  transform: scale3d(2.3, 2.3, 1);
}
.checkbox .checkbox-material .check {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 1px solid rgba(0,0,0, .54);
  overflow: hidden;
  z-index: 1;
  border-radius: 3px;
}
.checkbox .checkbox-material .check:before {
  position: absolute;
  content: "";
  transform: rotate(45deg);
  display: block;
  margin-top: -3px;
  margin-left: 7px;
  width: 0;
  height: 0;
  background: red;
  box-shadow: 0 0 0 0, 0 0 0 0, 0 0 0 0, 0 0 0 0, 0 0 0 0, 0 0 0 0, 0 0 0 0 inset;
  animation: checkbox-off 0.3s forwards;
}
.checkbox input[type=checkbox]:focus + .checkbox-material .check:after {
  opacity: 0.2;
}
.checkbox input[type=checkbox]:checked + .checkbox-material .check {
  background: #9c27b0;
}
.checkbox input[type=checkbox]:checked + .checkbox-material .check:before {
  color: #FFFFFF;
  box-shadow: 0 0 0 10px, 10px -10px 0 10px, 32px 0 0 20px, 0px 32px 0 20px, -5px 5px 0 10px, 20px -12px 0 11px;
  animation: checkbox-on 0.3s forwards;
}
.checkbox input[type=checkbox]:checked + .checkbox-material:before {
  animation: rippleOn 500ms;
}
.checkbox input[type=checkbox]:checked + .checkbox-material .check:after {
  animation: rippleOn 500ms forwards;
}
.checkbox input[type=checkbox]:not(:checked) + .checkbox-material:before {
  animation: rippleOff 500ms;
}
.checkbox input[type=checkbox]:not(:checked) + .checkbox-material .check:after {
  animation: rippleOff 500ms;
}
fieldset[disabled] .checkbox, fieldset[disabled] .checkbox input[type=checkbox],
.checkbox input[type=checkbox][disabled] ~ .checkbox-material .check,
.checkbox input[type=checkbox][disabled] + .circle {
  opacity: 0.5;
}
.checkbox input[type=checkbox][disabled] ~ .checkbox-material .check {
  border-color: #000000;
  opacity: .26;
}
.checkbox input[type=checkbox][disabled] + .checkbox-material .check:after {
  background-color: rgba(0,0,0, 0.87);
  transform: rotate(-45deg);
}

@keyframes checkbox-on {
  0% {
    box-shadow: 0 0 0 10px, 10px -10px 0 10px, 32px 0 0 20px, 0px 32px 0 20px, -5px 5px 0 10px, 15px 2px 0 11px;
  }
  50% {
    box-shadow: 0 0 0 10px, 10px -10px 0 10px, 32px 0 0 20px, 0px 32px 0 20px, -5px 5px 0 10px, 20px 2px 0 11px;
  }
  100% {
    box-shadow: 0 0 0 10px, 10px -10px 0 10px, 32px 0 0 20px, 0px 32px 0 20px, -5px 5px 0 10px, 20px -12px 0 11px;
  }
}
@keyframes rippleOn {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 0.2;
  }
  100% {
    opacity: 0;
  }
}
@keyframes rippleOff {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 0.2;
  }
  100% {
    opacity: 0;
  }
}