JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="conteudo">
    <li class="nav-item"><a href="#">Página 1</a></li>
    <li class="nav-item"><a href="#">Página 2</a></li>
    <li class="nav-item"><a href="#">Página 3</a></li>
</ul>

<input type="checkbox" id="nav-trigger" class="nav-trigger" />
<label for="nav-trigger">Menu</label>

<div class="conteudo-movel">
    <p>Meu menu off-canvas.</p>
</div>

CSS

body {
    overflow-x: hidden;
}

.conteudo {
    background: #f6f6f6;
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 0;
    list-style: none;
}

.nav-trigger {
    position: absolute;
    clip: rect(0, 0, 0, 0);
}

label[for="nav-trigger"] {
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 2;
    padding: 4px 8px;
    cursor: pointer;
    background-color: #f00;
}

.nav-trigger:checked + label {
    left: 515px;
}

.nav-trigger:checked ~ .conteudo-movel {
    left: 500px;
}

.nav-trigger + label, .conteudo-movel {
    transition: left 0.2s;
}

.conteudo-movel {
    min-width: 100%;
    min-height: 100%;
    background-color: #fff;
    position: relative;
    top: 0;
    bottom: 100%;
    left: 0;
    color: #fff;
    z-index: 1;
    padding: 4em;
    background-color: #000;
    background-size: 200%;
}