css简单美化搜索框

<form>
    <input type="text" placeholder="搜索...">
    <button type="submit">搜索</button>
</form>

form {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

input[type="text"] {
    width: 250px;
    height: 40px;
    padding: 10px;
    font-size: 18px;
    border: none;
    border-bottom: 2px solid grey;
    outline: none;
}

button[type="submit"] {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 18px;
    cursor: pointer;
    border-radius: 4px;
}

button[type="submit"]:hover {
    background-color: #3e8e41;
}

ps：