dat.gui/gui.css

#guidat { 
position: absolute;
border: 1px solid red;
width: 300px;
z-index: 200;
top: 0;
left: 100%;
margin-left: -320px;
-moz-transition: margin-top .2s ease-out;
-webkit-transition: margin-top .2s ease-out;
transition: margin-top .2s ease-out;
}

#guidat-controllers { 
height: 300px;
overflow-y: scroll;
}

#guidat-toggle { 
text-align: center;
display: block;
padding: 5px;
}