input type 체크할때 btn label 이 색깔이 안바뀝니... - 인프런

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <link rel="stylesheet" href="/style.css">
</head>
<body>
<div class="tab-inner">
    <input type="radio" name="tabmenu" id="tab1" checked>
    <input type="radio" name="tabmenu" id="tab2">
    <input type="radio" name="tabmenu" id="tab3">
    <div class="tabs">
        <div class="items">
            <div>
                <h1>Content 01</h1>
            </div>
            <div>
                <h1>Content 02</h1>
            </div>
            <div>
                <h1>Content 03</h1>
            </div>
        </div>
        <div class="btn">
            <label for="tab1"></label>
            <label for="tab2"></label>
            <label for="tab3"></label>
        </div>
    </div>
</div>
</body>
</html>

body {
   line-height: 1.5em;
   margin: 0;
   color: #222;
}
.tab-inner {}
input[name=tabmenu] {
    display: none;
}
.tabs {
    overflow: hidden; 
    position: relative;
    height: 100vh;
}
.items {
    height: 100vh;
    width: 300%;
    transition: 0.5s;
    position: absolute;
    top: 0;
    left: 0;
}
.items div {
    height: 100vh;
    float: left;
    width: 33.33333%;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
}
.items div:nth-child(1){
    background-color: teal;
}
.items div:nth-child(2){
    background-color: dodgerblue;
}
.items div:nth-child(3){
    background-color: yellowgreen;
}
.items div h1 {
    font-size: 80px;
    font-weight: normal;
}
.btn {
    position: absolute;
    bottom: 20px;
    width: 100%;
    text-align: center;
}
.btn label {
    display: inline-block;
    height: 16px;
    width: 16px;
    border-radius: 20px;
    background-color: #c4c4c4;
    cursor: pointer;
}
input[id=tab1]:checked ~ .tabs .items {
    left: 0;
}
input[id=tab2]:checked ~ .tabs .items {
    left: -100%;
}
input[id=tab3]:checked ~ .tabs .items {
    left: -200%;
}

input[id=tab1]:checked ~ .btn label[for=tab1],
input[id=tab2]:checked ~ .btn label[for=tab2],
input[id=tab3]:checked ~ .btn label[for=tab3] {
    background-color: #fff;
}
인프런 커뮤니티 질문&답변

input type 체크할때 btn label 이 색깔이 안바뀝니다
