styles.css

.RRT__container {
  position: relative;
}

/****************************/
/******** tab styles ********/
/****************************/
.RRT__tabs {
  display: flex;
  flex-wrap: wrap;
}

.RRT__accordion {
  flex-direction: column;
}

.RRT__tab {
  background: #eee;
  border-style: solid;
  border-color: #ddd;
  border-width: 1px 1px 1px 0;
  cursor: pointer;
  z-index: 1;
  white-space: nowrap;
  padding: .7em 1em;
}

.RRT__tab:focus {
  outline: 0;
  background-color: #e6e6e6;
}

.RRT__accordion .RRT__tab {
  border-left-width: 1px;
}

.RRT__tab--first {
  border-left-width: 1px;
}

.RRT__tab--selected {
  background: #fff;
  border-color: #ddd #ddd #fff;
}

.RRT__tab--selected:focus {
  background-color: #fff;
}

.RRT__tab--disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.RRT__tab:focus {
  z-index: 2;
}

/****************************/
/********* panel styles *****/
/****************************/
.RRT__panel {
  margin-top: -1px;
  padding: 1em;
  border: 1px solid #ddd;
}

.RRT__accordion .RRT__panel {
  margin-top: 0;
}

/****************************/
/******* showmore control ***/
/****************************/
.RRT__showmore {
  background: #eee;
  border: 1px solid #ddd;
  cursor: pointer;
  z-index: 1;
  white-space: nowrap;
  margin-left: -1px;
  position: relative;
}

.RRT__showmore-label {
  padding: .7em 1em;
  position: relative;
  bottom: -1px;
  z-index: 1;
}

.RRT__showmore-label--selected {
  background-color: #eee;
}

.RRT__showmore-list {
  position: absolute;
  right: -1px;
  top: 100%;
  display: none;
}

.RRT__showmore-list--opened {
  display: block;
}

/****************************/
/********** inkbar **********/
/****************************/
.RRT__inkbar-wrapper {
  width: 100%;
}

.RRT__inkbar {
  position: relative;
  bottom: 0;
  height: 2px;
  margin-top: -2px;
  background-color: deepskyblue;
  transition: left 800ms cubic-bezier(0.23, 1, 0.32, 1);
  z-index: 2;
}