body,
html {
    width: 100%;
    height: 100%;
    padding: 0px;
    margin: 0px;
    overflow: hidden;
    background: #000;
    list-style-type: none;
}

h1 {
    text-align: center;
}

li {
    cursor: pointer;
}

.wrapper {
    max-width: 800px;
    height: 100%;
    margin: 0px auto;
    position: relative;
}

#button_paused {
    display: none;
    position: absolute;
    left: 0;
    top: 0;
}

.canvas {
    display: block;
    width: 100%;
    height: 90%;
    background: #000;
}

#main_menu,
#main_menu_paused {
    height: 100vh;
    text-align: center;
    color: white;
    font-size: 5vh;
}

#main_menu ul {
    display: block;
    margin: 0px auto;
    padding-left: 0;
}

#main_menu ul li {
    padding-top: 5vh;
}

#main_menu_paused {
    width: 100%;
    height: 100%;
    display: none;
    color: white;
}

.controller {
    height: 10%;
    display: flex;
    justify-content: stretch;
}

.controller button {
    flex-grow: 1;
}