Untitled

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <!--Маштабирование страницы-->
    <meta http-equiv="x-ua-compatible" content="ie=edge"> <!--Выбор версии браузера microsoft edge-->
    <title>Практика бутстрап</title>
    <link rel="stylesheet" href="css/bootstrap.css">
</head>
<body>
    <div class="container-fluid">
    <div class="row p-5">
        <div class="col col-md-12 " style="border:none;" >Заголовок</div>
    </div>
    <div class="row ">
        <div class="col col-md-4 ">1/3</div>
        <div class="col col-md-4">1/3</div>
        <div class="col col-md-4">1/3</div>
    </div>
    <div class="row " >
        <div class="col col-md-4 "><br>1/3<br><br></div>
        <div class="col col-md-8"><br>2/3<br><br></div>
    </div>
    <div class="row ">
        <div class="col col-md-3 ">1/4</div>
        <div class="col col-md-6">1/2</div>
        <div class="col col-md-3 ">1/4</div>
    </div>
    <div class="row ">
        <div class="col col-md-3 ">1/4</div>
        <div class="col col-md-3">1/4</div>
        <div class="col col-md-3 ">1/4</div>
        <div class="col col-md-3 ">1/4</div>
    </div>
    <div class="row ">
        <div class="col col-md-3 ">1/4</div>
        <div class="col col-md-3">1/4</div>
        <div class="col col-md-3 ">1/4</div>
        <div class="col col-md-3 ">1/4</div>
    </div>
    <div class="row">
        <div class="col col-md-2 ">1/6</div>
        <div class="col col-md-7">7/12</div>
        <div class="col col-md-3 ">1/4</div>
    </div>
   </div>
</body>
<script src="js/jquery.js"></script>
<script src="js/bootstrap.js"></script>
<style>
    body
    {
        font-size: 20px;
    }

 div
 {
    border:1px solid black;
    text-align: center;
    min-height: 50px;
 }

</style>
</html>