.thumb1 {
  padding: 5px;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.3s;
  max-width:100%;
  max-width:300px;
  max-height: 170px;
}

.thumb1:hover {opacity: 0.7;}

/* The Close Button */
/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px) {
	.thumb1 {
		max-width:100%;
	}

	.thumb1 {
		max-height: 170px; 
	}
}