/* Add your CSS styles here */

/* Example styles: */

​

/* Basic styles */

body {

    font-family: Arial, sans-serif;

    margin: 0;

    padding: 0;

}

​

.form-container {

    max-width: 600px;

    margin: 20px auto;

    padding: 20px;

    border: 1px solid #ccc;

    border-radius: 5px;

}

​

fieldset {

    display: none;

}

​

fieldset:first-of-type {

    display: block;

}

​

/* Additional styles for form elements, buttons, etc. */

Uncheck Guild Install in the Installation tab and try again!

Answer source: https://www.reddit.com/r/Discord_Bots/comments/1e6r0ua/private_application_cannot_have_a_default/