#thang-components-edit-view position: absolute top: 40px bottom: 0 left: 0 right: 0 .column position: absolute top: 0 bottom: 0 padding: 5px box-sizing: border-box h3 margin: 5px 0 #extant-components-column left: 0 width: 20% .treema position: absolute top: 80px left: 0 right: 10px bottom: 0 overflow: scroll #add-component-column right: 0 width: 20% .treema position: absolute top: 75px left: 10px right: 0px bottom: 0 overflow: scroll #component-config-column-view border-left: 1px solid black border-right: 1px solid black right: 20% left: 20%