单选样式自定义

<div class="container">
  <div class="radio">
    <input id="radio-1" name="radio" type="radio" checked>
    <label for="radio-1" class="radio-label">Checked</label>
  </div>

  <div class="radio">
    <input id="radio-2" name="radio" type="radio">
    <label  for="radio-2" class="radio-label">Unchecked</label>
  </div>

  <div class="radio">
    <input id="radio-3" name="radio" type="radio" disabled>
    <label for="radio-3" class="radio-label">Disabled</label>
  </div>
</div>
body {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  min-height: 100vh;
}

.radio {
  margin: 0.9rem;
}
.radio input[type="radio"] {
  position: absolute;
  opacity: 0;
}
.radio input[type="radio"] + .radio-label:before {
  content: '';
  background: #f4f4f4;
  border-radius:3px;
  border:1px solid cyan;
  display: inline-block;
  width: 1.4em;
  height: 1.4em;
  position: relative;
  top: -0.3em;
  margin-right: 1em;
  vertical-align: top;
  cursor: pointer;
  text-align: center;
  -webkit-transition: all 250ms ease;
  transition: all 250ms ease;
}
.radio input[type="radio"]:checked + .radio-label:before {
  
 content: '√';
  box-shadow: inset 0 0 0 4px #f4f4f4;
}
.radio input[type="radio"]:focus + .radio-label:before {
  outline: none;
  border-color: #3197EE;
}
.radio input[type="radio"]:disabled + .radio-label:before {
  box-shadow: inset 0 0 0 4px #f4f4f4;
  border-color: #b4b4b4;
  background: #b4b4b4;
}
.radio input[type="radio"] + .radio-label:empty:before {
  margin-right: 0;
}