FuckButtons Theme/CSS-Code! This is a Discord Custom CSS code or Theme to remove certain annoying buttons, such as the Nitro Gift, Stickers, GIFS, Apps or the Voice Chat User Area's Activity button. You can edit the code to remove ones you don't want removed.

FUCKBUTTONS.theme.css

/**
 * @name FUCK BUTTONS Theme
 * @author OrieDargon
 * @version 4.2
 * @description This is a CSS code or Theme for Discord to remove certain annoying buttons, such as the Nitro Gift, Stickers, GIFS, Apps or the Voice Chat User Area's Activity button. You can edit the code to remove ones you don't want removed.
 * @source https://gist.github.com/OrieDargon/220ec8eee4bd6ae1da043ca6f3f0cf9d
*/

/*This project is inspired by cheesits456's theme of a similar function, called "Remove Buttons" https://gist.github.com/cheesits456/41d659f932b5a574b5dfb9b391a4506e*/
/*They had not updated their theme in a few years, and with all the the new discord UI updates, I decided to figure out how to alter it in a way that works now with the help of the comment thread.*/
/*I'm not great at CSS code, so I might not be able to update this all the time. Lemme know if there are any issues, or if there's any buttons I should add optionally*/



/*You may remove or comment out any bit of code you want, if you would prefer to have certain buttons.*/

/*Removes: "Sticker Picker" button in the right of the chat box.*/
[class*="buttons__"] div[aria-label="Open sticker picker"] {
    display: none;
}

/*Removes: "GIF Picker" button in the right of the chat box.*/
[class*="buttons__"] div[aria-label="Open GIF picker"] {
    display: none;
}

/*Removes: "Nitro Gift" button in the right of the chat box.*/
[class*="buttons__"] div[aria-label="Send a gift"] {
    display: none;
}

/*Removes: "Apps" button in the right of the chat box.*/
[class*="buttons__"] div[aria-label="Apps"] {
    display: none;
}

/*Removes: Voice Chat "Apps" button in Bottom Left User Area. You can also still access this if needed if you click into the voice call window.*/
[class*="actionButtons_"] button:nth-child(5) {
    display: none;
}

/*Voice Chat Channel "Invite to Voice" member-like popup when joining an empty VC*/
div.animation_f2170c {
	display: none;
}

Works like a charm!