.portfolio-outer{
  position: relative;
  margin-bottom: 20px;
}

.portfolio-outer .image{
  position: relative;
  margin-bottom: 30px;
}

.portfolio-outer .image img{
  display: block;
  width: 100%;
  border-radius: 5px;
}

.portfolio-outer .image .icon{
  position: absolute;
  left: 50%;
  top: 50%;
  height: 50px;
  width: 50px;
  background: var(--primary-color);
  border-radius: 50%;
  color: #ffffff;
  text-align: center;
  line-height: 50px;
  -webkit-transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
  transform: translate(-50%,-50%);
  pointer-events: none;
  -webkit-transition: all 300ms ease;
  -o-transition: all 300ms ease;
  transition: all 300ms ease;
  opacity: 0;
  visibility: hidden;
}

.portfolio-outer .image:hover .icon{
  opacity: 1;
  visibility: visible;
}