This CSS rule changes the color of a button in the email

Hello, This CSS rule changes the color of a button in the email. The problem is that the button becomes invisible because of this. It should only act on the maildrop interface and not in the message.

In the example here, you see that the button is not visible because of this rule.

tr:nth-child(2n+1) > td {
    background-color: #e3e9eb;
}