body {
    overflow: hidden;
    min-width:800px;
    margin:0px;
}

#editor { 
    margin: 0;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}
  
#preview {
    background-color: white;
    width: 100%;
    height: 100%;
    top: 0;
    position: absolute;
}