husstanden/templates/layout/includes/side_nav.html

<style>
#sidenav {
    background-color: #B507DB;
    border-radius: 4px;

    z-index: 100;

    display: flex;
    flex-direction: column;

    max-width: 100%;
    height: 100%;
}

#sidenav div {
    display: flex;
    flex-direction: column;
}

#sidenav a, #sidenav h4 {
    color: white;
}

.navlist div, .navlist div > a {
    display: flex;
    flex-grow: 1;
}

.navlist div > a > span {
    flex-grow: 1;
}

.navlist div > a > i:last-child {
    justify-content: flex-end;
}

.navlist div > a > * {
	margin-left: 10px;
	margin-right: 10px;
}

.hidden {
    display: none !important;
}
</style>
<div class="d-flex flex-column" id="sidenav">
    <div class="top">
        <!-- Here be logo area -->
		<!-- <img alt="Logo" src="{{ url_for('static', filename='img/logo.svg') }}" height="40px"/> -->
    </div>
    <div class="navlist">
        <!-- Here be dropdown menus -->
        <div class="p-2"> <!-- Padding -->
			<div class="flex-column">
                <div> <!-- Collection -->
                    <a href="#dash">
                        <i class="fa fa-chart-bar"></i><span>Dashboard</span>
                        <i class="fas fa-chevron-right"></i>
                    </a>
                    <div class="hidden"> <!-- Hidden until clicked #dash -->
                        <div class="flex-column">
                            <div>
                                <a href="#dash-test">Test</a> <!-- TODO: Add dot prefix -->
                            </div>
                            <div>
                                <a href="#dash-demo">Demo</a>
                            </div>
                        </div>
                    </div>
                </div>
                <div>
                    <h4>Title card</h4> <!-- TODO: Padding and such -->
                </div>
                <div>
                    <a href="#bills">
                        <i class="fa fa-chart-bar"></i><span>Bills</span>
                        <i class="fas fa-chevron-right"></i>
                    </a>
                    <div class="hidden">
                        <ul>
                            <li>
                                <a href="#bills-bills">Bills</a>
                            </li>
                            <li>
                                <a href="#bills-log">Log</a>
                            </li>
                        </ul>
                    </div>
                </div>
                <div>
                    <a href="#recieps">
                        <i class="fa fa-chart-bar"></i><span>Recieps</span>
                        <i class="fas fa-chevron-right"></i>
                    </a>
                    <div class="hidden">
                        <ul>
                            <li>
                                <a href="#recieps-recieps">Recieps</a>
                            </li>
                            <li>
                                <a href="#recieps-log">Log</a>
                            </li>
                        </ul>
                    </div>
                </div>
			</div>
        </div>
    </div>
</div>