form {
            margin-top: 50px;
            text-align: center;
            background-color: #f2f2f2;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0px 0px 10px #888888;
        }
        /* 输入框 */
        input[type="text"] {
            width: 500px;
            height: 40px;
            padding: 10px;
            margin-bottom: 20px;
            border-radius: 5px;
            border: none;
            background-color: #fff;
            font-size: 16px;
        }
        /* 提交按钮 */
        input[type="submit"] {
            width: 100px;
            height: 40px;
            background-color: #4CAF50;
            color: #fff;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        /* 自定义搜索 */
       .placeholder {
            color: #999;
            font-size: 14px;
        }

/* 自定义搜索 */
.placeholder {
    color: #999;
    font-size: 14px;
}

.color {
    color: black;
}

.placeholder {
    color: #999;
    font-size: 14px;
}

.placeholder {
    color: #999;
    font-size: 14px;
}
.placeholder {
    color: #999;
    font-size: 14px;
}