style.css

/**
*  Nestable css
*/
.dd {
  position: relative;
  display: block;
  margin: 0;
  padding: 0;
  max-width: 600px;
  list-style: none;
  font-size: 13px;
  line-height: 20px;
}

.dd-list {
  display: block;
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.dd-list .dd-list {
  padding-left: 30px;
}

.dd-collapsed .dd-list {
  display: none;
}

.dd-item,
.dd-empty,
.dd-placeholder {
  display: block;
  position: relative;
  margin: 0;
  padding: 0;
  min-height: 20px;
  font-size: 13px;
  line-height: 20px;
}

.dd-handle {
  display: block;
  height: 30px;
  margin: 5px 0;
  padding: 5px 10px;
  color: #333;
  text-decoration: none;
  font-weight: bold;
  border: 1px solid #ccc;
  background: #fafafa;
  background: -webkit-linear-gradient(top, #fafafa 0%, #eee 100%);
  background: -moz-linear-gradient(top, #fafafa 0%, #eee 100%);
  background: linear-gradient(top, #fafafa 0%, #eee 100%);
  -webkit-border-radius: 3px;
  border-radius: 3px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
}

.dd-handle:hover {
  color: #2ea8e5;
  background: #fff;
}

.dd-item > button {
  display: block;
  position: relative;
  cursor: pointer;
  float: left;
  width: 25px;
  height: 20px;
  margin: 5px 0;
  padding: 0;
  text-indent: 100%;
  white-space: nowrap;
  overflow: hidden;
  border: 0;
  background: transparent;
  font-size: 12px;
  line-height: 1;
  text-align: center;
  font-weight: bold;
}

.dd-item > button:before {
  content: '+';
  display: block;
  position: absolute;
  width: 100%;
  text-align: center;
  text-indent: 0;
}

.dd-item > button[data-action="collapse"]:before {
  content: '-';
}

.dd-placeholder,
.dd-empty {
  margin: 5px 0;
  padding: 0;
  min-height: 30px;
  background: #f2fbff;
  border: 1px dashed #b6bcbf;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
}

.dd-empty {
  border: 1px dashed #bbb;
  min-height: 100px;
  background-color: #e5e5e5;
  background-image: -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),
    -webkit-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
  background-image: -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),
    -moz-linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
  background-image: linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff),
    linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%, #fff);
  background-size: 60px 60px;
  background-position: 0 0, 30px 30px;
}

.dd-dragel {
  position: absolute;
  pointer-events: none;
  z-index: 9999;
}

.dd-dragel > .dd-item .dd-handle {
  margin-top: 0;
}

.dd-dragel .dd-handle {
  -webkit-box-shadow: 2px 4px 6px 0 rgba(0, 0, 0, .1);
  box-shadow: 2px 4px 6px 0 rgba(0, 0, 0, .1);
}

/**
* Nestable Extras
*/
.nestable-lists {
  display: block;
  clear: both;
  padding: 30px 0;
  width: 100%;
  border: 0;
  border-top: 2px solid #ddd;
  border-bottom: 2px solid #ddd;
}

#nestable-menu {
  padding: 0;
  margin: 20px 0;
}

#nestable-output,
#nestable2-output {
  width: 100%;
  height: 7em;
  font-size: 0.75em;
  line-height: 1.333333em;
  font-family: Consolas, monospace;
  padding: 5px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
}

#nestable2 .dd-handle {
  color: #fff;
  border: 1px solid #999;
  background: #bbb;
  background: -webkit-linear-gradient(top, #bbb 0%, #999 100%);
  background: -moz-linear-gradient(top, #bbb 0%, #999 100%);
  background: linear-gradient(top, #bbb 0%, #999 100%);
}

#nestable2 .dd-handle:hover {
  background: #bbb;
}

#nestable2 .dd-item > button:before {
  color: #fff;
}

.dd {
  //  float: left;
  //  width: 48 %;
  width: 80%;
}

.dd + .dd {
  margin-left: 2%;
}

.dd-hover > .dd-handle {
  background: #2ea8e5 !important;
}

/**
* Nestable Draggable Handles
*/
.dd3-content {
  display: block;
  height: 30px;
  margin: 5px 0;
  padding: 5px 10px 5px 40px;
  color: #333;
  text-decoration: none;
  font-weight: bold;
  border: 1px solid #ccc;
  background: #fafafa;
  background: -webkit-linear-gradient(top, #fafafa 0%, #eee 100%);
  background: -moz-linear-gradient(top, #fafafa 0%, #eee 100%);
  background: linear-gradient(top, #fafafa 0%, #eee 100%);
  -webkit-border-radius: 3px;
  border-radius: 3px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
}

.dd3-content:hover {
  color: #2ea8e5;
  background: #fff;
}

.dd-dragel > .dd3-item > .dd3-content {
  margin: 0;
}

.dd3-item > button {
  margin-left: 30px;
}

.dd3-handle {
  position: absolute;
  margin: 0;
  left: 0;
  top: 0;
  cursor: pointer;
  width: 30px;
  text-indent: 100%;
  white-space: nowrap;
  overflow: hidden;
  border: 1px solid #aaa;
  background: #ddd;
  background: -webkit-linear-gradient(top, #ddd 0%, #bbb 100%);
  background: -moz-linear-gradient(top, #ddd 0%, #bbb 100%);
  background: linear-gradient(top, #ddd 0%, #bbb 100%);
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.dd3-handle:before {
  content: '≡';
  display: block;
  position: absolute;
  left: 0;
  top: 3px;
  width: 100%;
  text-align: center;
  text-indent: 0;
  color: #fff;
  font-size: 20px;
  font-weight: normal;
}

.dd3-handle:hover {
  background: #ddd;
}


/*
* Nestable++
*/
.button-delete {
  position: absolute;
  top: 4px;
  right: -26px;
}

.button-edit {
  position: absolute;
  top: 4px;
  right: -52px;
}

#menu-editor {
  margin-top: 40px;
}

#saveButton {
  padding-right: 30px;
  padding-left: 30px;
}

.output-container {
  margin-top: 20px;
}

#json-output {
  margin-top: 20px;
}