單選多選樣式寫法

動畫多選樣式

// html
<div id="box">
    <input type="checkbox" id="check" name="check" />
    <label for="check">Checkbox</label>
</div>

// css
input[type=checkbox]+label:before {
    height: 16px;
    line-height: 16px;
    width: 16px;
    border: 1px solid #000;
    display: inline-block;
    vertical-align: top;
    text-align: center;
    margin-right: 5px;
    content: "\2713";
    color: transparent;
    transition: color ease .3s;
}
input[type=checkbox]:checked+label:before {
    color: #000;
}

單選按鈕樣式

// html
<div id="box">
    <input type="radio" id="check" name="check" />
    <label for="check">Checkbox</label>
</div>
// css
input[type=radio] {
    display: none;
}
input[type=radio]+label:before {
    display: inline-block;
    width: 16px;
    height: 16px;
    line-height: 14px;
    text-align: center;
    vertical-align: top;
    margin-right: 20px;
    content: "\26AB";
    border: 1px solid #000;
    border-radius: 50%;
    font-size: 0;
    transition: font-size ease .3s;
}
input[type=radio]:checked+label:before {
    font-size: 12px;
}

參考

掘金-22個必備的CSS小技巧