body{
    background-color: #EEE;
}
aside{
    position:fixed;
    top: 0;
    right: 0;
    z-index: 999;
    display: flex;
}
#menu-opener {
    width: 40px;
    height: 40px;
    cursor: pointer;
    margin-top: 10px;
    margin-right: 10px;
}
#menu-area{
    width: 0px;
    height: 100vh;
    background-color: #CCC;
    overflow-x: hidden;
    overflow-y: auto;
    transition: all ease .5s;
}
#menu-area li{
    display: block;
    padding: 10px;
    color:#555;
    cursor: pointer;
}
#menu-area li:hover{
    background-color: #DDD;
}

.menu-opened{
    width: 200px !important;
}