.mbwp-btt-wrapper>div {
  position: fixed;
  /*bottom: 30px;/**/
  /*right: 30px;/**/
  display: block;
  z-index: 10;
  /*
  background-color: #8bc34a;/**/
  /* width: 35px;/**/
  /* height: 35px;/**/
  transition: all 0.3s ease-in-out;
  visibility: hidden;
  opacity: 0;
  /*padding: 10px;/**/
}

.mbwp-btt-wrapper>div.show {
  visibility: visible;
  opacity: 1;
}