CSSを使用してラジオとチェックボックスのスタイルをカスタマイズする例の詳細な説明

<label>
    <span class="diyRadio">
        <input type="radio" name=" value="">
    </span>
    <span>文字</span>
</label>

<!-- HTML -->
<p class="radio-beauty-container">
    <label>
        <span class="radio-name">radio1</span>
        <input type="radio" name="radioName" id="radioName1" hidden/>
        <label for="radioName1" class="radio-beauty"></label>
    </label>
    <label>
        <span class="radio-name">radio2</span>
        <input type="radio" name="radioName" id="radioName2" hidden/>
        <label for="radioName2" class="radio-beauty"></label>
    </label>
    <label>
        <span class="radio-name">radio3</span>
        <input type="radio" name="radioName" id="radioName3" hidden/>
        <label for="radioName3" class="radio-beauty"></label>
    </label>
</p>

/* CSS */
.radio-beauty-container {
  font-size: 0;
}
.radio-beauty-container .radio-beauty:hover, .radio-beauty-container input[type="radio"]:checked + .radio-beauty {
  padding: 2px;
  background-color: green;
  background-clip: content-box;
}
.radio-beauty-container .radio-name {
  vertical-align: middle;
  font-size: 16px;
}
.radio-beauty-container .radio-beauty {
  width: 18px;
  height: 18px;
  box-sizing: border-box;
  display: inline-block;
  border: 1px solid green;
  vertical-align: middle;
  margin: 0 15px 0 3px;
  border-radius: 50%;
}
.radio-beauty-container .radio-beauty:hover {
  box-shadow: 0 0 7px green;
}