$resizing-border: 2px solid blue; #components-table-demo-resizable-column { padding: 20px; .resizing { border-right: 2px solid blue; } } #components-table-demo-resizable-column .react-resizable { position: relative; background-clip: padding-box; } #components-table-demo-resizable-column .react-resizable-handle { position: absolute; width: 10px; height: 100%; bottom: 0; right: -5px; cursor: col-resize; z-index: 1; &:hover { .react-resizable { border-right: 2px solid blue; } } }