.splitpanes__splitter{background-color:#ccc;position:relative}.splitpanes__splitter:before{content:"";opacity:0;z-index:1;background-color:#ff00004d;transition:opacity .4s;position:absolute;top:0;left:0}.splitpanes__splitter:hover:before{opacity:1}.splitpanes--vertical>.splitpanes__splitter:before{z-index:999;height:100%;right:-10px}.splitpanes--horizontal>.splitpanes__splitter:before{z-index:999;width:100%;bottom:-10px}