Fancy CSS styling for Radio Buttons and Checkboxes

checkboxes.scss

/*********************
  Fancy CSS Textboxes
**********************/

$light-blue: #609FD5;

input[type="checkbox"] {
  position: absolute;
  left: -9999px;
  visibility: hidden;
}

input[type="checkbox"]:not(:checked) + label,
input[type="checkbox"]:checked + label {
  position: relative;
  padding-left: 30px !important;
  cursor: pointer;
  margin-bottom: 0;
  user-select: none;
}

input[type="checkbox"] + label + small {
  position: relative;
  top: -5px;
}

/* checkbox aspect */
input[type="checkbox"]:not(:checked) + label:before,
input[type="checkbox"]:checked + label:before {
  content: '';
  position: absolute;
  left: 0;
  top: 1px;
  width: 20px;
  height: 20px;
  border: 1px solid #ccc;
  background: #fff;
  border-radius: 2px;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
}

/* disabled cursor */
input[type="checkbox"] + label.disabled {
  cursor: not-allowed;
}

/* disabled checkbox aspect */
input[type="checkbox"] + label.disabled:before {
  background-color: #eee;
}

/* checked mark aspect */
input[type="checkbox"]:not(:checked) + label:after,
input[type="checkbox"]:checked + label:after {
  content: '';
  background: image-url("icon-check-white.svg") center center no-repeat $light-blue;
  background-size: 50%;
  width: 20px;
  height: 20px;
  position: absolute;
  top: 1px;
  left: 0; 
  transition: .28s ease;
  border-radius: 2px;
}

/* checked mark aspect changes */
input[type="checkbox"]:not(:checked) + label:after {
  opacity: 0;
  transform: scale(0);
}

input[type="checkbox"]:checked + label:after {
  opacity: 1;
  transform: scale(1);
}

.fancy-checkbox {
  padding: 5px 0;
  margin-bottom: 15px;
}
.fancy-checkbox label {
  user-select: none;
}

icon-check-white.svg

<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 18.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="Layer_1" xmlns:sketch="http://www.bohemiancoding.com/sketch/ns"
     xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 12 9"
     enable-background="new 0 0 12 9" xml:space="preserve">
<title>icon-check-grey</title>
<desc>Created with Sketch.</desc>
<g id="Onboarding-Flow" sketch:type="MSPage">
    <g id="Apply---Personal-Info" transform="translate(-634.000000, -197.000000)" sketch:type="MSArtboardGroup">
        <g id="icon-check-grey" transform="translate(634.000000, 194.000000)" sketch:type="MSLayerGroup">
            <path id="check" sketch:type="MSShapeGroup" fill="#FFFFFF" d="M3.2,10.2l1.4-1.4L1.8,6L0.3,7.4L3.2,10.2z M3.2,10.2l1.4,1.4
                l7.1-7.1l-1.4-1.4L3.2,10.2z"/>
        </g>
    </g>
</g>
</svg>

radios.scss

/*********************
  Fancy CSS Radios
**********************/

$light-blue: #609FD5;

/* Remove default Radio Buttons */
[type="radio"]:not(:checked),
[type="radio"]:checked {
  position: absolute;
  left: -9999px;
  visibility: hidden;
}

[type="radio"]:not(:checked) + label,
[type="radio"]:checked + label {
  position: relative;
  padding-left: 28px;
  cursor: pointer;
  display: inline-block;
  height: 25px;
  line-height: 25px;
  transition: .28s ease;
  -khtml-user-select: none; /* webkit (konqueror) browsers */
  user-select: none;
  margin-right: 20px;
}

[type="radio"] + label:before,
[type="radio"] + label:after {
  background-color: #fff;
  content: '';
  position: absolute;
  left: 0;
  top: 3px;
  margin: 0px;
  width: 20px;
  height: 20px;
  z-index: 0;
  transition: .28s ease;
}

/* Unchecked styles */
[type="radio"]:not(:checked) + label:before {
  border-radius: 50%;
  border: 1px solid #ccc;
}
[type="radio"]:not(:checked) + label:after {
  border-radius: 50%;
  border: 1px solid #ccc;
  transform: scale(0);
  z-index: -1;
}

/* Checked styles */
label.boolean {
  font-weight: normal;
}
[type="radio"]:checked + label:before {
  border: 1px solid transparent;
  border-radius: 50%;
}
[type="radio"]:checked + label:after {
  background-color: $light-blue;
  border-radius: 50%;
  border: 1px solid $light-blue;
  transform: scale(1.02);
  z-index: 0;
}

/* Radio With gap */
[type="radio"]:checked + label:before {
  border-radius: 50%;
  border: 1px solid $light-blue;
}
[type="radio"]:checked + label:after {
  border-radius: 50%;
  border: 1px solid $light-blue;
  background-color: $light-blue;
  z-index: 0;
  transform: scale(.5);
}

/* Disabled Radio With gap */
[type="radio"]:disabled:checked + label:before {
  border: 2px solid #ccc;
}
[type="radio"]:disabled:checked + label:after {
  border: none;
  background-color: #ccc;
}

/* Disabled style */
[type="radio"]:disabled:not(:checked) + label:before,
[type="radio"]:disabled:checked + label:before {
  background-color: transparent;
  border-color: #ccc;
}
[type="radio"]:disabled + label {
  color: #ccc;
}
[type="radio"]:disabled:not(:checked) + label:before {
  border-color: #ccc;
}
[type="radio"]:disabled:checked + label:after {
  background-color: #ccc;
  border-color: #ccc;
}

/* Rails SimpleForm errors */
div.field_with_errors [type="radio"]:not(:checked) + label:before {
  border: 1px solid #d9534f;
  background: #fff6f6;
}