html - CSS: '+' selection operator not working -

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the background color of span not change after radio button changed should.

why happening? how fix it?

div {    margin: 0 0 0.75em 0;  }  .formgroup input[type="radio"] {    display: none;  }  input[type="radio"],  label {    color: brown;    font-family: arial, sans-serif;    font-size: 14px;  }  input[type="radio"],  label span {    display: inline-block;    width: 19px;    height: 19px;    margin: -1px 4px 0 0;    vertical-align: middle;    cursor: pointer;    -moz-border-radius: 50%;    border-radius: 50%;  }  input[type="radio"],  label span {    background-color: brown;  }        input[type="radio"]:checked + p + span{       background-color:orange;  }  input[type="radio"] + span,  input[type="radio"]:checked + span {    -webkit-transition:background-color 0.4s linear;    -o-transition:background-color 0.4s linear;    -moz-transition:background-color 0.4s linear;    transition:background-color 0.4s linear;  }
<div class="main">    <section class="artistpage">      <div class="search">        <h1>artist directory</h1>       </div>      <ul class="artistlist">        <li class="artist cf">          <div class="info">            <label class="formgroup">              <input type="radio">              <span></span>op1              <span></span>op2              <span></span>op3            </label>          </div>        </li>      </ul>  </div>

whichever radio option choose, first 1 gets selected.

your radio button group isn't way supposed be. suggest alter that.

<ul class="artistlist">   <li class="artist cf">     <div class="info">       <label class="formgroup">         <input type="radio" name = "op"><span></span>op1         <input type="radio" name = "op"><span></span>op2         <input type="radio" name = "op"><span></span>op3       </label>     </div>   </li> </ul>

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