Custom Logo in Jupyter Notebook

custom.css

#ipython_notebook {
    height: 40px !important;
}
#ipython_notebook img{                                                                                        
    display:block;
    background: url(logo.png) no-repeat;    
    background-size: contain;
    width: 233px;
    height: 33px;
    padding-left: 233px;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}