Custom CSS for Discord to remove the GIF picker and Nitro Gift buttons from the message bar

RemoveButtons.theme.css

/**
 * @name Remove Buttons
 * @version 1.1.1
 * @author cheesits456
 * @authorId 306018440639152128
 * @description Remove the nitro gift, GIF picker, and sticker picker buttons from the message box. Also remove the sticker suggestion popup
 * @source https://gist.github.com/cheesits456/41d659f932b5a574b5dfb9b391a4506e
 * @invite 7QH4YeD
 * @donate https://donate.haileybot.com
 * @website https://cheesits456.dev
*/

/* Hide Nitro gift button */
button[aria-label="Send a gift"] {
    display: none;
}
/* Hide GIF picker button */
button[aria-label="Open GIF picker"] {
    display: none;
}
/* Hide sticker picker button */
button[aria-label="Open sticker picker"] {
    display: none;
}
/* Hide annoying sticker popup window that appears when you type */
.channelTextArea-1FufC0 > .container-1ZA19X {
    display: none;
}

changing to div worked for me, however not hiding the parent div messes with the formatting of the message bar buttons. If the user adds more custom buttons (such as with the SendTimestamps plugin vencord offers), the spacing will be far to the left.
This should fix that:

div:has(> [aria-label="Send a gift"]),
button:has(> [aria-label="Send a gift"]) {
  display: none !important;
}

/* hide GIF picker */
div:has(> [aria-label="Open GIF picker"]),
button:has(> [aria-label="Open GIF picker"]) {
  display: none !important;
}

/* hide sticker picker */
div:has(> [aria-label="Open sticker picker"]),
button:has(> [aria-label="Open sticker picker"]) {
  display: none !important;
}

This covers both div and button. Currently its a div at the time of writing.

Any way to remove the Quests tab above DMs?

Any way to remove the Quests tab above DMs?

here's how I removed it on my end:

/* remove quest button in DMs */
a[href="/quest-home"]{
    display:none;
}

This is my current list of tweaks, removing multiple annoyances. These are just selectors, grab the ones you want, put them in a single rule, and use display: none !important as the rule body (the !important isn't required for most, but doesn't hurt and I think some do need it).

A few of these rely on element order. This makes them language-agnostic (unlike the aria-label method many others use), but it means they will break if Discord changes the order. That happens infrequently enough that I prefer this method.

All the buttons in the message field except the emoji button (and the + button, that's in a different container):

[class^=channelTextArea] [class^=buttons]>div:not(:nth-child(4))

All the buttons and their container, in case you don't even want the emoji button:

[class^=channelTextArea] [class^=buttons]

The "send longer messages with Nitro!" nag box:

[class*=upsell]

(This one might also affect other upselling pop-ups. Good riddance.)

Buttons that show up on messages on hover:

div[class^=buttons][role=group]

Events, shop, Nitro, Quests in DMs list:

a[href="/activities"], a[href="/shop"], a[href="/store"], a[href="/quest-home"]

App launcher (games in voice channels):

[class^=channelAppLauncher]

Edit image with apps hover button:

div[class^=imageContainer] > *[class^=hoverButtonGroup] > *:first-child

Server tags that show up on user names:

[class*="chipletContainer"]

And this one I usually don't bother with, but this removes the custom backgrounds in server member lists, because for some reason Discord doesn't have an option to disable/hide them:

[class^=member] img[class^=img] {
    display: none;
}
[class^=member] [class^=container] {
    background: none !important;
}

I use Vencord, so I want to leave the plugin buttons on. Here's my list of tweaks, thanks to everyone above:

/* Hide unnecessary stuff */
[class^="buttons"] .expression-picker-chat-input-button:not(div[class*="vc-chatbar-button"]), /* Emoji, GIF and sticker buttons */
[class^="buttons"] *[aria-label="Send a gift"], /* Gift Nitro button */
[class^="buttons"] .buttonContainer_e6e74f.app-launcher-entrypoint, /* App launcher button */
[class^="channelAppLauncher"], /* Apps in VCs */
[class*="chipletContainer"], /* Server tags */
[class*="upsell"], /* Nitro upsell box */
[href="/activities"], /* Activities */
[href="/library"], /* Big library button */
[href="/store"], /* Big store button */
[href="/shop"], /* Big shop button */
[href="/quest-home"], /* Big quest/mission button */
.tutorialContainer__650eb+div, /* Discovery button in server list */
div[class^="containerDefault_"]:has(div[data-list-item-id^="channels___upcoming-events"]) /* Events list in server */
{
	display: none;
}

class stuff. thanks!