.main {
  padding-top: 80px;
  padding-bottom: 80px
}
.project-list ul {
  margin: -20px -20px 0;
  display: flex;
  flex-wrap: wrap;
  padding: 0;
}
  
.project-list ul li {
  width: 25%;
  padding: 20px;
}

.project-list ul li>a {
  position: relative;
  overflow: hidden;
  display: block
}

.project-list ul li img {
  display: block;
  width: 100%
}

.project-list ul li .txt {
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 15px;
  z-index: 2;
  background: rgba(255,255,255,.9);
  padding: 15px;
  transition: opacity .2s,transform .35s
}

.project-list ul li .txt h6 {
  margin: 0;
  font-size: 15px;
  color: #212121;
  line-height: 1.5;
  height: 45px;
  font-weight: 500;
  overflow : hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.project-list ul li:hover .txt {
  background: var(--bg-color);
}

.project-list ul li:hover .txt h6 {
  color: #fff
}

@media screen and (max-width: 1367px) {
  .main {
    padding-top: 70px;
    padding-bottom: 70px
  }
}

@media screen and (max-width: 1281px) {
  .main {
    padding-top: 60px;
    padding-bottom: 60px
  }
  .project-list ul li { 
    width: 33.3333%
  }
}

@media screen and (max-width: 1171px) {
  .project-list ul {
      margin: -15px -15px 0
  }
  .project-list ul li {
      padding: 15px
  }
}

@media screen and (max-width: 992px) {
  .main {
    padding-top: 50px;
    padding-bottom: 50px
  }
  .project-list ul li {
    width: 50%
  }
}

@media screen and (max-width: 768px) {
  .main {
    padding-top:35px;
    padding-bottom: 35px;
  }
  .project-list ul li .txt {
    left: 10px;
    right: 10px;
    bottom: 10px;
    padding: 10px
  }
  .project-list ul li .txt h6 {
    font-size: 14px;
    height: 43px;
  }
}

@media screen and (max-width: 576px) {
  .project-list ul {
    margin: -6px -6px 0
  }
  .project-list ul li {
    padding: 6px
  }
}

@media screen and (max-width: 480px) {
  .project-list ul {
    margin: -6px 0 0
  }
  .project-list ul li {
    width: 100%;
    padding: 6px 0
  }
}