.gallery_sec{
  width:100%;
  padding:80px 0;
}
.heading{
  width:100%;
  text-align:center;
}
.heading h2{
  font-size:30px;
  font-weight:bold;
  border-bottom:2px solid #000;
  padding-bottom:25px;
}
.gallery_sec img{
  width:100%;
  margin-bottom:30px;
  height:250px;
}

.gallery_sec a {
    position: relative;
    transition: 0.3s ease-in-out;
    -webkit-transition: 0.3s ease-in-out;
    -moz-transition: 0.3s ease-in-out;
    -ms-transition: 0.3s ease-in-out;
    -o-transition: 0.3s ease-in-out;
}


.gallery_sec a::before {
    position: absolute;
    content: "";
    width: 30px;
    height: 30px;
    background: none;
    background-size: contain;
    background-repeat: no-repeat;
  top:45%;
  left:50%;
  transform:translate(-50%, -50%);
}

.gallery_sec img {
    transition: 0.3s ease-in-out;
    -webkit-transition: 0.3s ease-in-out;
    -moz-transition: 0.3s ease-in-out;
    -ms-transition: 0.3s ease-in-out;
    -o-transition: 0.3s ease-in-out;
}

.gallery_sec a:hover img {
    position: relative;
    width: 100%;
}

.gallery_sec a:hover img {
    opacity: 0.2;
}

.gallery_sec a:hover::before {
    position: absolute;
    content: "";
    width: 50px;
    height: 50px;
    background: url(https://i.ibb.co/3fMkjjF/Resize.png);
    background-size: contain;
    background-repeat: no-repeat;
    z-index: 99;
}