.portfolio {
  margin-top: 120px;
}
.portfolio .filters {
  list-style-type: none;
  height: 30px;
  margin-bottom: 40px;
  margin-top: -20px;
  text-align: center;
}
.portfolio .filters li {
  display: inline-block;
  margin: 0 6px;
  font-size: 20px;
}
.portfolio .filters li.separator {
  color: #c0c0c0;
  font-weight: lighter;
}
.portfolio .filters li a {
  color: #3f3f3f;
  font-style: italic;
  -webkit-transition: color .2s;
  -moz-transition: color .2s;
  -ms-transition: color .2s;
  transition: color .2s;
}
.portfolio .filters li a:hover, .portfolio .filters li a.active {
  color: #1189d9;
}
.portfolio .gallery_container {
  margin-bottom: 50px;
}
.portfolio .gallery_container .photo {
  position: relative;
  float: left;
  width: 23%;
  margin: 1%;
}

.portfolio .gallery_container .photo:hover .mask {
  display: block;
  opacity: 1;
  filter: alpha(opacity=100);
}
.portfolio .gallery_container .photo .mask {
  position: absolute;
  opacity: 0;
  filter: alpha(opacity=0);
  box-shadow: 0 1px 6px 2px #b1b1b1;
  top: 0;
  left: 0;
  border-radius: 5px;
  height: 100%;
  padding: 0 20px;
  width: 100%;
  background: rgba(17, 137, 217, 0.5);
  -webkit-transition: opacity .25s ease-in-out;
  -moz-transition: opacity .25s ease-in-out;
  transition: opacity .25s ease-in-out;
}
.portfolio .gallery_container .photo .mask h3 {
  color: #fff;
  font-size: 22px;
  position: relative;
  top: 39%;
}
.portfolio .gallery_container .photo .mask small {
  color: #f0f0f0;
  font-size: 15px;
  font-style: italic;
  position: relative;
  top: 35%;
  display: block;
}
.portfolio .gallery_container .photo .mask .more {
  color: #fff;
  font-size: 30px;
  font-weight: bold;
  position: absolute;
  bottom: 7%;
  left: 47%;
}
/*Responsive
******************************/
@media (max-width: 991px) {
  .portfolio .gallery_container .photo {
    width: 48%;
    margin: 1%;
  }
}
@media (max-width: 480px) {
  .portfolio .filters li {
    margin: 0 4px;
  }
  .portfolio .filters li a {
    font-size: 18px;
  }
  .portfolio .gallery_container .photo {
    /*margin-left: 35px;*/
  }
  .portfolio .gallery_container .photo img {
    left: 10%; }
}