A CodePen by mitchmc. CSS only Custom Radio and Checkboxes - Based on the webdesign tuts+ article (link below) but instead of using images I used only css. http://webdesign.tutsplus.com/tutorials/htmlcss-tutorials/quick-tip-easy-css3-checkboxes-and-radio-buttons/

index.html

<div>
 <input type="checkbox" id="check01" name="check" />
 <label for="check01"><span></span>Check Box 1</label>
</div>
  
<div>
  <input type="checkbox" id="check02" name="check" />
  <label for="check02"><span></span>Check Box 2</label>
</div>

<div>
   <input type="checkbox" id="check03" name="check" />
   <label for="check03"><span></span>Check Box 3</label>
</div>
  
<div>
  <input type="radio" id="radio01" name="radio" />
  <label for="radio01"><span></span>Radio Button 1</label>
</div>

<div>
 <input type="radio" id="radio02" name="radio" />
 <label for="radio02"><span></span>Radio Button 2</label>
</div>

style.scss

@import "compass";
$DarkBrown: #292321;

$Orange: #CC3300;

div {
  margin:0 0 0.75em 0;
}

input[type="checkbox"],
input[type="radio"] {
    display:none;
}

input[type="checkbox"] + label,
input[type="radio"] + label {
    color: $DarkBrown;
    font-family:Arial, sans-serif;
    font-size:14px;
}

input[type="checkbox"] + label span,
input[type="radio"] + label span {
    display:inline-block;
    width:19px;
    height:19px;
    margin:-1px 4px 0 0;
    vertical-align:middle;
    cursor:pointer;
    -moz-border-radius:  50%;
    border-radius:  50%;
}

input[type="checkbox"] + label span,
input[type="radio"] + label span {
     background-color:$DarkBrown;
}

input[type="checkbox"]:checked + label span,
input[type="radio"]:checked + label span{
     background-color:$Orange;
}

input[type="checkbox"] + label span,
input[type="checkbox"]:checked + label span,
input[type="radio"] + label span,
input[type="radio"]:checked + label span {
  -webkit-transition:background-color 0.4s linear;
  -o-transition:background-color 0.4s linear;
  -moz-transition:background-color 0.4s linear;
  transition:background-color 0.4s linear;
}