.content{
  color: #fff;
  text-align: center;
  background: var(--bgDefault);
  position: relative;
}

.content::after{
  content: "";
  width: 30px;
  height: 30px;
  background: inherit;
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  z-index: 1;
}

.content .btOpenForm{margin: 0 auto;}

@media only screen and (min-width: 768px){
  .content::after{
    width: 40px;
    height: 40px;
    bottom: -20px;
  }
}