.sm-accordion {
  background-color: #888899;
  color: #FFFFFF;
  cursor: pointer;
  padding: 10px;
  width: 100%;
  margin-top: 7px;
  border: none;
  text-align: left;
  padding-right: 28px;
  outline: none;
  font-size: 15px;
  transition: 0.4s;
  position: relative;
}

.sm-accordion:hover {
  background-color: #87CEEB;
}

.sm-accordion-active {
  background-color: #61A5C7;
}

.sm-accordion:after {
  content: attr(data-open-symbol); /* ΕΔΩ */
  color: #FFFFFF;
  font-size: 15px;
  font-weight: bold;
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  user-select: none;
}

.sm-accordion-active:after {
  content: attr(data-close-symbol); /* ΕΔΩ */
}

.sm-accordion-panel {
  padding: 0 15px;
  max-height: 0;
  margin-top: 5px;
  overflow: hidden;
  transition: max-height 0.4s ease-out;
}