* {
  box-sizing: border-box;
}
h1 {
  text-align: center;
}
.ImgThumbnail {
  
  cursor: pointer;
  transition: 0.3s;
  height: 250px;
  width: 300px;
}
.ImgThumbnail:nth-of-type(1) {
  margin-left: 20%;
}
.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.9);
}
.modalImage {
  margin: auto;
  display: block;
  width: 50%;
  height: 60%;
  max-width: 700px;
}
#caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
  height: 150px;
}
.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}
.close:hover,
.close:focus {
  color: rgb(255, 0, 0);
  cursor: pointer;
}
@media only screen and (max-width: 700px) {
  .modalImage {
     width: 100%;
  }
}