#editor {
    position: fixed;
    bottom: 0;
    right: 0;
    width: 40%;
    height: 40%;
    z-index: 1000;
    margin: 8px;
    resize: both;
    opacity: 1;
    border-radius: 6px;
    overflow: hidden;
    transition: opacity .3s linear
}

#editor:hover {
    opacity: 1
}