spee.ch/client/scss/vertical-split/_vertical-split.scss

.vertical-split {
  flex           : 1 0 auto;
  display        : flex;
  flex-direction : column;
  justify-content: space-between;
  align-items    : center;
};

.collapse-content.closed{
  display: none;
}

.collapse-button {
  outline: none;
  background: none;
  border: none;
  display: block;
  margin: 15px auto 0;
  width: 24px;
  height: 24px;
  padding: 0;
  svg {
    stroke: $brand-color;
    &.plus-icon {
      transform: rotate(0);
      transition: all 0.4s ease;
    }
  }

  &:hover {
    .plus-icon {
      transform: rotate(-180deg);
    }
  }
}