#dz {
    min-width: 100px;
    max-width: 100px;
    min-height: 100px;
    max-height: 100px;
    border: 1px dashed black;
    vertical-align: middle;
    text-align: center;
}

textarea {
    min-height: 250px;
}

#workspace {
    border: 1px solid lightgray;
    min-width: 300px;
    max-width: 300px;
    min-height: 300px;
    max-height: 300px;
    
}

#workspace > div {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: scroll;
}