.radio-center > .mes-radio {}
.aaaform-control-wrap > .class-mes {}.aaaform-control-wrap.mes-radio {}
.aaaradio.class-mes {}<div class="radio-center">
<span class="aaaform-control-wrap mes-radio mes-radio--wrap">
<span class="aaaform-control aaaradio class-mes class-mes--aaaradio" id="id-mes">
<span class="aaalist-item first">
<label><input type="radio" name="mes-radio" value="до года" checked=""><span class="aaalist-item-label">до года</span></label></span>
<span class="aaalist-item">
<label><input type="radio" name="mes-radio" value="1-3 лет"><span class="aaalist-item-label">1-3 лет</span></label></span>
<span class="aaalist-item">
<label><input type="radio" name="mes-radio" value="3-5 лет"><span class="aaalist-item-label">3-5 лет</span></label></span>
<span class="aaalist-item last">
<label><input type="radio" name="mes-radio" value="от 5 лет"><span class="aaalist-item-label">от 5 лет</span></label></span>
</span>
</span>
</div>.mes-radio.mes-radio--wrap {}
.class-mes.class-mes--aaaradio{}position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
<div class="container">
<div class="row">
<div class="col-2 sidebar">
sidebar
</div>
<div class="col-10 offset-2">
content
</div>
</div>
</div>.sidebar {
position: fixed;
height: 100vh;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="OwlCarousel2-2.2.1/dist/assets/owl.carousel.css">
<link rel="stylesheet" href="OwlCarousel2-2.2.1/dist/assets/owl.theme.default.css">
</head>
<body>
<div class="owl-carousel">
<div> Your Content </div>
<div> Your Content </div>
<div> Your Content </div>
<div> Your Content </div>
<div> Your Content </div>
<div> Your Content </div>
<div> Your Content </div>
</div>
<script src="jquery-3.3.1.min.js"></script>
<script src="OwlCarousel2-2.2.1/dist/owl.carousel.js"></script>
<script>
$(".owl-carousel").owlCarousel();
</script>
</body>
</html>