创建 CSS 艺术是一项令人愉快的挑战

    <meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><style>        .smiley {            width: 100px;            height: 100px;            border: 2px solid black;            border-radius: 50%;            position: relative;        }        .eye {            width: 20px;            height: 20px;            background-color: black;            border-radius: 50%;            position: absolute;        }        .left-eye {            top: 30px;            left: 30px;        }        .right-eye {            top: 30px;            right: 30px;        }        .mouth {            width: 60px;            height: 30px;            border: 2px solid black;            border-top-left-radius: 50px;            border-top-right-radius: 50px;            position: absolute;            bottom: 20px;            left: 20px;        }    </style><div class="smiley">        <div class="eye left-eye"></div>        <div class="eye right-eye"></div>        <div class="mouth"></div>    </div>