<style>

.wrap-check-days{padding:0px 0px 10px;display:table;table-layout: fixed;width: 100%;}

.wrap-check-days .item {display: table-cell; padding:0 4px;}

.wrap-check-days input[type=radio]{display:none}

.wrap-check-days input[type=radio]+label{display:inline-block;cursor:pointer;width:100%;border:1px solid #ededed;border-radius: 4px;text-align:center;padding:10px;}

.wrap-check-days input[type=radio]+label{background-color:#fff;color:#333}

.wrap-check-days input[type=radio]:checked+label{background-color:#333;color:#fff}

</style>

<div class="wrap-check-days">

    <div class="item"><input type="radio" name=""><label>test</label></div>

    <div class="item"><input type="radio" name=""><label>test</label></div>

    <div class="item"><input type="radio" name=""><label>test</label></div>

    <div class="item"><input type="radio" name=""><label>test</label></div>

</div>