.bellows {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  margin-top: 35px;
}

.bellows__header {
  position: relative;
  padding: 15px 20px;
  border: 1px solid #2980b9;
  border-width: 0 0 1px;
  background: #3498db;
  color: white;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
}

.bellows__header:active {
  background: #2980b9;
}

.bellows__header::before, .bellows__header::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 20px;
  z-index: 2;
  display: block;
  width: 16px;
  height: 4px;
  margin-top: -2px;
  background: white;
  -webkit-transition: -webkit-transform 0.25s ease-in-out;
          transition: transform 0.25s ease-in-out;
  pointer-events: none;
}

.bellows__header::before {
  content: '';
  -webkit-transform: rotate(0deg);
      -ms-transform: rotate(0deg);
          transform: rotate(0deg);
}

.bellows__header::after {
  -webkit-transform: rotate(90deg);
      -ms-transform: rotate(90deg);
          transform: rotate(90deg);
}

.bellows__item.bellows--is-open > .bellows__header::before,
.bellows__item.bellows--is-opening > .bellows__header::before {
  -webkit-transform: rotate(180deg);
      -ms-transform: rotate(180deg);
          transform: rotate(180deg);
}

.bellows__item.bellows--is-open > .bellows__header::after,
.bellows__item.bellows--is-opening > .bellows__header::after {
  -webkit-transform: rotate(360deg);
      -ms-transform: rotate(360deg);
          transform: rotate(360deg);
}

.bellows__item:last-child > .bellows__header {
  border-bottom: 0;
}

.bellows__header h1,
.bellows__header h2,
.bellows__header h3,
.bellows__header h4 {
  margin: 0;
  color: #fff;
  font-size: 18px;
}

.bellows__content {
  padding: 20px;
  border: 1px solid #ecf0f1;
}

.bellows__content .bellows {
  margin-top: 20px;
}