portfolio.css

#extra {
  padding: 50px 40px;
  background-color: black;
}

.extra-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  grid-gap: 80px;
  margin-top: 50px;
}

.extra {
  border-radius: 10px;
  position: relative;
  overflow: hidden;
}

.extra img {
  width: 100%;
  height: 35em;
  border-radius: 10px;
  display: block;
  transition: transform 0.5s;
}

.layer {
  width: 100%;
  height: 0;
  color: white;
  background: linear-gradient(rgba(0, 0, 0, 0.6), #0ddff2bb);
  border-radius: 10px;
  position: absolute;
  left: 0;
  bottom: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 0 40px;
  text-align: center;
  font-size: 14px;
  transition: height 0.5s;
}

.layer h3 {
  font-weight: 500;
  margin-bottom: 20px;
}

.layer a {
  margin-top: 20px;
  color: #0ddff2bb;
  text-decoration: none;
  font-size: 18px;
  line-height: 60px;
  background: #fff;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  text-align: center;
}

.extra:hover img {
  transform: scale(1.1);
}

.extra:hover .layer {
  height: 100%;
}

.btn {
  display: block;
  margin: 50px auto;
  width: fit-content;
  border: 1px solid #0ddff2bb;
  padding: 14px 50px;
  border-radius: 6px;
  text-decoration: none;
  color: white;
  transition: background 0.5s;
}

.btn:hover {
  background: #0ddff2bb;
}