CSS3 custom radio button

gistfile1.scss

input[type=radio] {
  display: none;

  & + label {
    position: relative;
    padding-left: 24px;
    cursor: pointer;

    &::before,
    &::after {
      position: absolute;
      content: '';
      top: 50%;
      left: 0;
      display: block;
    }

    &::before {
      width: 18px;
      height: 18px;
      margin-top: -9px;
      background-color: #fff;
      border: 2px solid #ccc;
      border-radius: 50%;
    }
  }

  &:checked + label::after {
    left: 5px;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    background-color: #000;
    border-radius: 50%;
  }
}

gistfile2.haml

%div
  = f.radio_button :hoge, :yes
  = f.label :hoge, 'hoge yes', value: :yes
%div
  = f.radio_button :hoge, :no
  = f.label :hoge, 'hoge no', value: :no