css的clear清除浮动

清除前
清除后
代码
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            .contianer{
                 600px;
                height: 200px;
                
            }
            .a{
                 50px;
                height: 100px;
                float: left;
                background-color: green;
            }
            p:nth-of-type(1){
                color: red;
                
            }
            p:nth-of-type(2){
                clear:left;
            }
        </style>
    </head>
    <body>
        <div class="contianer">
            <div class="a"></div>
            <p class="b">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat nulla reprehenderit commodi porro obcaecati voluptates veritatis minus harum est corporis?</p>
            <p class="b">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ea doloremque magnam consectetur ducimus quia eos quas saepe. Fugit corporis!</p>
        </div>
    </body>
</html>