<div class="cp_ipradio05">
  <ul>
    <li class="list_item">
      <label><input type="radio" class="option-input"  name="cpipr05" checked>ネコ</label>
    </li>
    <li class="list_item">
      <label><input type="radio" class="option-input" name="cpipr05">イヌ</label>
    </li>
    <li class="list_item">
      <label><input type="radio" class="option-input" name="cpipr05">ウサギ</label>
    </li>
  </ul>
</div>

.cp_ipradio05 {
  margin: 2em auto;
}
.cp_ipradio05 ul {
  list-style: none;
}
.cp_ipradio05 .list_item {
  margin-bottom: 10px;
}
/*ラベルの設定*/
.cp_ipradio05 label {
  position: relative;
  display: flex;
  align-items: center;
  cursor: pointer;
}
/*ラジオボタンの設定*/
.cp_ipradio05 .option-input {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 22px;
  /*デフォルト値を無効に*/
  border: none;
  outline: none;
  appearance: none;
}
.cp_ipradio05 .option-input:before,
.cp_ipradio05 .option-input:after {
  position: absolute;
  content: '';
  border-radius: 50%;
}
.cp_ipradio05 .option-input:before {
  width: 20px;
  height: 20px;
  background: #ffffff;
  border: 2px solid #e5e5e5;
}
.cp_ipradio05 .option-input:after {
  display: block;
  width: 16px;
  height: 16px;
  background: #da3c41;
  transition: transform 0.4s cubic-bezier(0.45, 1.8, 0.5, 0.75);/*ぴょこんの動き*/
  transform: scale(0, 0);
}
/*checked時の設定*/
.cp_ipradio05 .option-input:checked:after {
  transform: scale(1, 1);
}