How do I make a custom checkbox and radio button in pure css?

Try the following:

DEMO

Html

<div class="checkbox"> 
  <label class="i-checks">
    <input type="checkbox" value=""> <i></i> Option one
  </label>
</div>
<div class="radio">
  <label class="i-checks">
    <input type="radio" checked="" value="option2" name="a"> <i></i> Option two checked
  </label>
</div>

      

        
        
        
      

    

CSS

.i-checks {
    padding-left: 20px;
    cursor: pointer;
}

.i-checks input {
    opacity: 0;
    position: absolute;
    margin-left: -20px;
}

.i-checks input:checked + i {
    border-color: #23b7e5;
}

.i-checks input:checked + i:before {
    left: 4px;
    top: 4px;
    width: 10px;
    height: 10px;
    background-color: #23b7e5;
}

.i-checks input:checked + span .active {
    display: inherit;
}

.i-checks input[type="radio"] + i, .i-checks input[type="radio"] + i:before {
    border-radius: 50%;
}

.i-checks input[disabled] + i, fieldset[disabled] .i-checks input + i {
    border-color: #dee5e7;
}

.i-checks input[disabled] + i:before, fieldset[disabled] .i-checks input + i:before {
    background-color: #dee5e7;
}

.i-checks > i {
    width: 20px;
    height: 20px;
    line-height: 1;
    border: 1px solid #cfdadd;
    background-color: #fff;
    margin-left: -20px;
    margin-top: -2px;
    display: inline-block;
    vertical-align: middle;
    margin-right: 4px;
    position: relative;
}

.i-checks > i:before {
    content: "";
    position: absolute;
    left: 10px;
    top: 10px;
    width: 0px;
    height: 0px;
    background-color: transparent;
    -webkit-transition: all 0.2s;
    transition: all 0.2s;
}

.i-checks > span {
    margin-left: -20px;
}

.i-checks > span .active {
    display: none;
}

      

        
        
        
      

    

OR - follow this url: http://fronteed.com/iCheck/