fieldset.River { width:230px; float:left; margin-left:0; }
fieldset.River>div.action { padding:0 10px; width:100%; display:flex; justify-content:center; }
// fieldset.River>div.action>div.item { text-align:center; flex:2; }
fieldset.River>div.output { width:230px; }
fieldset.River>div.output div.item { padding:10px 20px; border-left:solid 3px #00ffae; }
// fieldset.River>div.output div.item { padding:3px 16px; border-left:solid 3px #00ffae; }
fieldset.River>div.output div.list div.item { border-left:solid 3px #ccdc4c; }
fieldset.River>div.output div.list { padding-left:5px; margin-left:8px; }
fieldset.River>div.output div.list.hide { height:0; display:block; overflow:hidden; }