CSS only custom Checkbox and Radio UI

index.html

<h2>CSS only custom Checkbox and Radio UI <small><a href="http://bootstrapsale.com">http://bootstrapsale.com</a></small></h2>

<div class="box">
    <div class="checkbox">
        <label>
            <input type="checkbox" />
            <i class="input-helper"></i>
            <span>Maecenas faucibus mollis interdum.</span>
        </label>
    </div>
    
    <div class="checkbox">
        <label>
            <input type="checkbox" />
            <i class="input-helper"></i>
            <span>Integer posuere erat a ante venenatis dapibus posuere velit aliquet.</span>
        </label>
    </div>
    
    <div class="checkbox">
        <label>
            <input type="checkbox" />
            <i class="input-helper"></i>
            <span>Donec sed odio dui.</span>
        </label>
    </div>
    
    <hr />

    <div class="radio">
        <label>
            <input name="radio" type="radio" />
            <i class="input-helper"></i>
            <span>Aenean lacinia bibendum nulla sed consectetur.</span>
        </label>
    </div>
    <div class="radio">
        <label>
            <input name="radio" type="radio" />
            <i class="input-helper"></i>
            <span>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</span>
        </label>
    </div>
    <div class="radio">
        <label>
            <input name="radio" type="radio" />
            <i class="input-helper"></i>
            <span>Nulla vitae elit libero, a pharetra augue.</span>
        </label>
    </div>
</div>

index.scss

@import 'https://fonts.googleapis.com/css?family=Roboto';

* {
  padding: 0;
  margin: 0;
  
}

body {
  font-size: 14px;
  color: #333;
  padding: 50px;
  font-family: 'Roboto', sans-serif;
}

h2 {
    text-align: center;
    font-size: 25px;
    margin: 20px 0;
    color: #000;
    
    small {
        font-size: 14px;
        display: block;
        text-decoration: none;
        margin-top: 10px;
        
        a {
            text-decoration: none;
            color: #a2a2a2;
        }
    }
}

hr {
    background-color: #eee;
    border: 0;
    height: 1px;
    margin: 40px -50px;
}

.box {
    width: 500px;
    background: #fff;
    border-radius: 3px;
    padding: 50px;
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    right: 0;
    margin: auto;
    height: 245px;
}

.checkbox,
.radio {
  position: relative;
  margin-bottom: 20px;
  
  label {
    padding-left: 30px;
    display: block;
  }
  input {
    top: 0;
    left: 0;
    z-index: 1;
    cursor: pointer;
    opacity: 0;
    position: absolute;
    
    &:checked + .input-helper {
      &:before {
        border-color: #009688;
      }
    }
  }
  .input-helper {
    &:before,
    &:after {
      position: absolute;
      content: "";
      transition: all 200ms;
    }
    &:before {
      left: 0;
      border: 2px solid #7a7a7a;
    }
  }
}

.checkbox {
    input {
        width: 15px;
        height: 15px;

        &:checked + .input-helper {
            &:before {
                background-color: #009688;
            }
          
          &:after {
            transform: scale(1);
            opacity: 1;
          }
        }
    }

    .input-helper {
        &:before {
            top: -2px;
            width: 15px;
            height: 15px;
            border-radius: 2px;
            color: #fff;
        }
      
      &:after {
        content: '\2713';
        font-size: 13px;
        left: 4px;
        top: 2px;
        color: #fff;
        transform: scale(0);
        opacity: 0;
      }
    }
}


.radio {
    input {
        width: 16px;
        height: 16px;

        &:checked + .input-helper {
            &:after {
                transform: scale(1);
            }
        }
    }

    .input-helper {
        &:before {
            top: -3px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
        }

        &:after {
            width: 10px;
            height: 10px;
            background: #009688;
            border-radius: 50%;
            top: 2px;
            left: 5px;
            transform: scale(0);
        }
    }
}