Fix the classroom turn in button on docs. Makes it function correctly when used with multiple accounts, and look more modern.

tib-fix.user.js

// ==UserScript==
// @name        Turn in button fixer
// @namespace   https://easrng.github.io/
// @match       https://docs.google.com/*
// @grant       none
// @version     1.0
// @author      easrng
// @description Fix the classroom turn in button on docs. Makes it function correctly when used with multiple accounts, and look more modern.
// ==/UserScript==
const realopen=window.open;
window.open=(...e)=>{
  let u=new URL(e[0])
  if(u.pathname=="/url"&&u.hostname.includes("google.")) u=new URL(u.searchParams.get("q"))
  if(u.hostname.includes("google")) u.searchParams.set("authuser",new URL(document.querySelector('#gb a[href^="https://myaccount.google.com/?"]').href).searchParams.get("authuser")||"0")
  e[0]=u.href
  return realopen(...e)
}
let s=document.createElement("style");
s.textContent=`.docs-material #docs-script-button-bar .jfk-button:not(:root) {
    --matter-helper-theme: var(--matter-theme-rgb, var(--matter-primary-rgb, 33, 150, 243));
    position: relative;
    display: inline-block;
    box-sizing: border-box;
    border: solid 1px; /* Safari */
    border-color: rgba(var(--matter-onsurface-rgb, 0, 0, 0), 0.24) !important;
    border-radius: 4px;
    padding: 0 16px;
    min-width: 64px;
    height: 36px;
    vertical-align: middle;
    text-align: center;
    text-overflow: ellipsis;
    color: rgb(var(--matter-helper-theme)) !important;
    background-color: transparent;
    font-family: "Google Sans", Roboto, RobotoDraft, Helvetica, Arial, sans-serif;
    font-weight: 500;
    font-size: 14px;
    line-height: 34px;
    outline: none;
    cursor: pointer;
    box-shadow: none !important;
    text-transform: none;
}

.docs-material #docs-script-button-bar .jfk-button::-moz-focus-inner {
    border: none;
}

/* Highlight, Ripple */
.docs-material #docs-script-button-bar .jfk-button::before,
.docs-material #docs-script-button-bar .jfk-button::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 3px;
    opacity: 0;
}

.docs-material #docs-script-button-bar .jfk-button::before {
    background-color: rgb(var(--matter-helper-theme));
    transition: opacity 0.2s;
}

.docs-material #docs-script-button-bar .jfk-button::after {
    background: radial-gradient(circle at center, currentColor 1%, transparent 1%) center/10000% 10000% no-repeat;
    transition: opacity 1s, background-size 0.5s;
}

/* Hover, Focus */
.docs-material #docs-script-button-bar .jfk-button:hover::before {
    opacity: 0.04;
}

.docs-material #docs-script-button-bar .jfk-button:focus::before {
    opacity: 0.12;
}

.docs-material #docs-script-button-bar .jfk-button:hover:focus::before {
    opacity: 0.16;
}

/* Active */
.docs-material #docs-script-button-bar .jfk-button:active::after {
    opacity: 0.16;
    background-size: 100% 100%;
    transition: background-size 0s;
}

/* Disabled */
.docs-material #docs-script-button-bar .jfk-button:disabled {
    color: rgba(var(--matter-onsurface-rgb, 0, 0, 0), 0.38);
    background-color: transparent;
    cursor: initial;
}

.docs-material #docs-script-button-bar .jfk-button:disabled::before,
.docs-material #docs-script-button-bar .jfk-button:disabled::after {
    opacity: 0;
}`
document.head.appendChild(s)