I’m following along a tutorial and, unfortunately, his code editor automatically indented everything when he copied/pasted a new <div> (Sigh)  (In the second pic I cut off the top where it has LOGO in the top right on accident in the screenshot) The problem is i Room.html
This is what it currently looks like
This is what it should look like
Room.html File
{% extends 'main.html' %}
{% block content%}
<div class="room-container">
<div>
    <style>
        .room-container(
        display: grid;
        grid-template-columns: 3fr 1fr;
            )
    </style>
        <div class="room-container">
            <div>
            <h1>{{room.name}}</h1>
            <p>{{room.description}}</p>
            <div class="comment-wrapper">
                <h3> Conversations </h3>
                <hr>
                {% for message in room_messages %}
                    <div>
                        <a href="{% url 'delete-message' message.id %}">Delete</a>
                        <small>@{{message.user}} {{message.created|timesince}} ago </small>
                        <p>{{message.body}}</p>
                        <hr>
                    </div>
                {% endfor %}
            </div>
            <div>
                {% if request.user.is_authenticated %}
                <div class="comment-for">
                    <form method="POST" action="">
                    {% csrf_token %}
                    <input type="text" name="body" placeholder="Comment here.." />
                    </form>
                </div>
            </div>
        </div>
        
                {% endif %}
        <div>
            <h3>Participants</h3>
            <hr>
            {% for user in participants %}
                <div>
                    <p>@{{user.username}}</p>
                </div>
            {% endfor %}
        </div>
</div>
{% endblock %}
Main.html file
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-9'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>StudyBud</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
</head>
<body>
    {% include 'navbar.html' %}
    
    {% if messages %}
    <ul class="messages">
        {% for message in messages %}
        <li></li>{{ message }}</li>
        {% endfor %}
    </ul>
    {% endif %}
    {% block content %}
    {% endblock content %}
</body>
</html>
Navbar.html File
<a href="/">
    <h1>LOGO</h1>
</a>
<form method="GET" action="{% url 'home' %}">
    <input type="text" name="q" placeholder="Search Rooms..." />
</form>
{% if request.user.is_authenticated %}
<p>Hello {{ request.user }}</p>
<a href="{% url 'logout' %}">Logout</a>
{% else %}
<a href="{% url 'login' %}">Login</a>
{% endif %}
<hr>
Home.html*
from django.http import HttpResponse
from django.shortcuts import render, redirect
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.db.models import Q
from django.contrib.auth.models import User
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.forms import UserCreationForm
from .models import Room, Topic, Message
from .forms import RoomForm
# Create your views here.
#
# rooms = [
    #  {'id':1, 'name':'Lets learn Python!'},
    # {'id':2, 'name':'Design with me!'},
    # {'id':3, 'name':'Front End Devs!'},
#]
def loginPage(request):
    page = 'login'
    if request.user.is_authenticated:
        return redirect('home')
    if request.method == 'POST':
        password = request.POST.get('password').lower()
        username = request.POST.get('username')
        try:
            user = User.objects.get(username=username)
        except:
            messages.error(request, 'User does not exist')
            user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect('home')
        else:
            messages.error(request, 'Username OR Password not Valid')
    context = {'page': page}
    return render(request, 'base/login_register.html', context)
def logoutUser(request):
    logout(request)
    return redirect('home')
def registerPage(request):
    form = UserCreationForm()
    if request.method == 'POST':
        form = UserCreationForm(request.POST)
        if form.is_valid():
            user = form.save(commit=False)
            user.username = user.username.lower()
            user.save()
            login(request, user)
            return redirect('home')
        else:
            messages.error(request, 'An error occurred, try again.')
    return render(request, 'base/login_register.html', {'form': form})
def home(request):
    q = request.GET.get('q') if request.GET.get('q') != None else ''
    rooms = Room.objects.filter(
        Q(topic__name__icontains=q) |
        Q(name__icontains=q) |
        Q(Description__icontains=q)
    )
    topics = Topic.objects.all()
    room_count = rooms.count
    context = {'rooms': rooms, 'topics': topics, 'room_count': room_count}
    return render(request, 'base/home.html', context)
def room(request, pk):
    room = Room.objects.get(id=pk)
    room_messages = room.message_set.all().order_by('-created')
    participants = room.participants.all()
    if request.method == "POST":
        messages = Message.objects.create(
            user = request.user,
            room = room,
            body = request.POST.get('body')
        )
        room.participants.add(request.user)
        return redirect('room', pk=room.id)
    context = {'room': room, 'room_messages': room_messages, 'participants': participants}
    return render(request, 'base/room.html', context)
@login_required(login_url='login')
def createRoom(request):
    form = RoomForm()
    if request.method == 'POST':
        form = RoomForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('home')
    context = {'form': form}
    return render(request, 'base/room_form.html', context)
@login_required(login_url='login')
def updateRoom(request, pk):
    room = Room.objects.get(id=pk)
    form = RoomForm(instance=room)
    if request.user != room.host:
        return HttpResponse('You have no power here!')
    if request.method == 'POST':
        form = RoomForm(request.POST, instance=room)
        if form.is_valid():
            form.save()
            return redirect('home')
    context = {'form': form}
    return render(request, 'base/room_form.html', context)
@login_required(login_url='login')
def deleteRoom(request, pk):
    room = Room.objects.get(id=pk)
    if request.user != room.host:
        return HttpResponse('You have no power here!')
    if request.method == 'POST':
        room.delete()
        return redirect('home')
    return render(request, 'base/delete.html', {'obj': room})
@login_required(login_url='login')
def deleteMessage(request, pk):
    message = Message.objects.get(id=pk)
    if request.user != message.user:
        return HttpResponse('You have no power here!')
    if request.method == 'POST':
        message.delete()
        return redirect('home')
    return render(request, 'base/delete.html', {'obj': message})
Room_form.html
{% extends 'main.html' %}
{% block content %}
<div>
    <form method="POST" action="">
        {% csrf_token %}
        {{form.as_p}}
        <input type="Submit" value="Submit">
    </form>
</div>
{% endblock content %}
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Answer
There’s a lot of problems with your room.html file. First off, you want to use curly braces in your CSS style definition. Next, you want to paste your html into a code editor and make sure all the div tags line up appropriately.
For now, though, this should work.
room.html
{% extends 'main.html' %}
{% block content%}
<!-- don't forget curly braces for css definitions-->
<style>
    .room-container {
        display: grid;
        grid-template-columns: 3fr 1fr;
    }
</style>
<div class="room-container">
    <div>
        <!-- this is 3fr region -->
        <h1>{{room.name}}</h1>
        <p>{{room.description}}</p>
        <div class="comment-wrapper">
                <h3> Conversations </h3>
                <hr>
    {% for message in room_messages %}
            <div>
                <a href="{% url 'delete-message' message.id %}">Delete</a>
                <small>@{{message.user}} {{message.created|timesince}} ago </small>
                <p>{{message.body}}</p>
                <hr>
            </div>
    {% endfor %}
        </div>
        <div>
    {% if request.user.is_authenticated %}
            <div class="comment-for">
                <form method="POST" action="">
                {% csrf_token %}
                <input type="text" name="body" placeholder="Comment here.." />
                </form>
            </div>
    {% endif %}
        </div>
    </div>
    <div>
        <!-- this is 1fr region -->
        <h3>Participants</h3>
        <hr>
    {% for user in participants %}
        <div>
            <p>@{{user.username}}</p>
        </div>
    {% endfor %}
    </div>
</div>
{% endblock %}