.button-arrow {
  width: 50px;
  height: 50px;
  background-color: #FFFF00;
  box-shadow: 5px 5px 0 #9e9e22;
  margin-left: 15px;
  margin-right: 15px;
  cursor: pointer;
  transition: transform 100ms cubic-bezier(0,0,.89,2.45), opacity 200ms linear;
}

.button-arrow.-right {
  margin-left: 15px;
  margin-right: 15px;
}

.button-arrow:hover {
  transform: scale(1.03);
  opacity: 0.5;
}

.button-arrow::before {
  content: "";
  display: block;
  box-sizing: border-box;
  width: 15px;
  height: 15px;
  border: 15px solid transparent;
  border-left: 28px solid #000;
  transform: translateX(10px);
}

.button-arrow.-left::before {
  transform: rotate(180deg) translateX(10px);
}

.button-arrow .content {
  display: none;
}