Change radio button label's color when radio button is selected? [duplicate]

Question

Is there a way to have a label for a radio button's color change when the radio button is selected?

I want the label to be the same green it is on the hover state, but I can't seem to figure out how to achieve this?

label.btn span {
  font-size: 16px;
}
i.fa {
  font-size: 24px;
}
i.fa.fa-dot-circle-o {
  font-size: 24px;
}
label input[type="radio"] {
  color: #c8c8c8;
  display: inline;
}
label input[type="radio"] ~ i.fa.fa-dot-circle-o {
  display: none;
}
label input[type="radio"]:checked ~ i.fa.fa-circle-o {
  display: none;
}
label input[type="radio"]:checked ~ i.fa.fa-dot-circle-o {
  color: #78a025;
  display: inline;
  font-size: 24px;
}
label:hover input[type="radio"] ~ i.fa {
  color: #78A025;
}
label input[type="checkbox"] ~ i.fa.fa-square-o {
  color: #c8c8c8;
  display: inline;
}
label input[type="checkbox"] ~ i.fa.fa-check-square-o {
  display: none;
}
label input[type="checkbox"]:checked ~ i.fa.fa-square-o {
  display: none;
}
label input[type="checkbox"]:checked ~ i.fa.fa-check-square-o {
  color: #78A025;
  display: inline;
}
label:hover input[type="checkbox"] ~ i.fa {
  color: #78a025;
}
div[data-toggle="buttons"] label.active {
  color: #78a025;
}
div[data-toggle="buttons"] label {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: normal;
  line-height: 2em;
  text-align: left;
  white-space: nowrap;
  vertical-align: top;
  cursor: pointer;
  background-color: none;
  border: 0px solid #c8c8c8;
  border-radius: 3px;
  color: #c8c8c8;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
}
div[data-toggle="buttons"] label:hover {
  color: #78A025;
}
div[data-toggle="buttons"] label:active,
div[data-toggle="buttons"] label.active {
  -webkit-box-shadow: none;
  box-shadow: none;
}

<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css" rel="stylesheet">

<div class="row">
  <div class="col-xs-12">
    <br>Vertical radio:
    <br>
    <div class="btn-group btn-group-vertical" data-toggle="buttons">
      <label class="btn">
        <input type="radio" name='gender1' checked><i class="fa fa-circle-o fa-2x"></i><i class="fa fa-dot-circle-o fa-2x"></i>  <span>  Male</span>
      </label>
      <label class="btn">
        <input type="radio" name='gender1'><i class="fa fa-circle-o fa-2x"></i><i class="fa fa-dot-circle-o fa-2x"></i><span> Female</span>
      </label>
    </div>

  </div>
</div>

<div class="row">
  <div class="col-xs-12">
    <hr>Vertical checkbox:
    <br>
    <div class="btn-group btn-group-vertical" data-toggle="buttons">
      <label class="btn">
        <input type="checkbox" name='email1' checked><i class="fa fa-square-o fa-2x"></i><i class="fa fa-check-square-o fa-2x"></i>  <span> Marketing Email</span>
      </label>
      <label class="btn">
        <input type="checkbox" name='email2'><i class="fa fa-square-o fa-2x"></i><i class="fa fa-check-square-o fa-2x"></i><span> Alert Email</span>
      </label>
      <label class="btn">
        <input type="checkbox" name='email3'><i class="fa fa-square-o fa-2x"></i><i class="fa fa-check-square-o fa-2x"></i><span> Account Email</span>
      </label>
    </div>


  </div>
</div>

Here's a codepen for demonstration purposes cdpn.io/ENMMOz

Answer 1

You can't set the style of the label (as we don't have a parent selector in CSS), but you can style the text for the radiobutton or checkbox - the intended result - using this:

label input[type="radio"]:checked ~ span {
  color: #78a025;
}
label input[type="checkbox"]:checked ~ span {
  color: #78a025;
}

See demo below:

label.btn span {
  font-size: 16px;
}
i.fa {
  font-size: 24px;
}
i.fa.fa-dot-circle-o {
  font-size: 24px;
}
label input[type="radio"] {
  color: #c8c8c8;
  display: inline;
}
label input[type="radio"] ~ i.fa.fa-dot-circle-o {
  display: none;
}
label input[type="radio"]:checked ~ i.fa.fa-circle-o {
  display: none;
}
label input[type="radio"]:checked ~ i.fa.fa-dot-circle-o {
  color: #78a025;
  display: inline;
  font-size: 24px;
}
label:hover input[type="radio"] ~ i.fa {
  color: #78A025;
}
label input[type="checkbox"] ~ i.fa.fa-square-o {
  color: #c8c8c8;
  display: inline;
}
label input[type="checkbox"] ~ i.fa.fa-check-square-o {
  display: none;
}
label input[type="checkbox"]:checked ~ i.fa.fa-square-o {
  display: none;
}
label input[type="checkbox"]:checked ~ i.fa.fa-check-square-o {
  color: #78A025;
  display: inline;
}
label:hover input[type="checkbox"] ~ i.fa {
  color: #78a025;
}
div[data-toggle="buttons"] label.active {
  color: #78a025;
}
div[data-toggle="buttons"] label {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: normal;
  line-height: 2em;
  text-align: left;
  white-space: nowrap;
  vertical-align: top;
  cursor: pointer;
  background-color: none;
  border: 0px solid #c8c8c8;
  border-radius: 3px;
  color: #c8c8c8;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
}
div[data-toggle="buttons"] label:hover {
  color: #78A025;
}
div[data-toggle="buttons"] label:active,
div[data-toggle="buttons"] label.active {
  -webkit-box-shadow: none;
  box-shadow: none;
}
label input[type="radio"]:checked ~ span {
  color: #78a025;
}
label input[type="checkbox"]:checked ~ span {
  color: #78a025;
}

<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css" rel="stylesheet">

<div class="row">
  <div class="col-xs-12">
    <br>Vertical radio:
    <br>
    <div class="btn-group btn-group-vertical" data-toggle="buttons">
      <label class="btn">
        <input type="radio" name='gender1' checked><i class="fa fa-circle-o fa-2x"></i><i class="fa fa-dot-circle-o fa-2x"></i>  <span>  Male</span>
      </label>
      <label class="btn">
        <input type="radio" name='gender1'><i class="fa fa-circle-o fa-2x"></i><i class="fa fa-dot-circle-o fa-2x"></i><span> Female</span>
      </label>
    </div>

  </div>
</div>

<div class="row">
  <div class="col-xs-12">
    <hr>Vertical checkbox:
    <br>
    <div class="btn-group btn-group-vertical" data-toggle="buttons">
      <label class="btn">
        <input type="checkbox" name='email1' checked><i class="fa fa-square-o fa-2x"></i><i class="fa fa-check-square-o fa-2x"></i>  <span> Marketing Email</span>
      </label>
      <label class="btn">
        <input type="checkbox" name='email2'><i class="fa fa-square-o fa-2x"></i><i class="fa fa-check-square-o fa-2x"></i><span> Alert Email</span>
      </label>
      <label class="btn">
        <input type="checkbox" name='email3'><i class="fa fa-square-o fa-2x"></i><i class="fa fa-check-square-o fa-2x"></i><span> Account Email</span>
      </label>
    </div>


  </div>
</div>