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>