* {
  box-sizing: border-box;
}

/* The grid: Four equal columns that floats next to each other */
.icolumn {
  float: left;
  width: 25%;
  padding: 5px;
}

/* Style the images inside the grid */
.icolumn img {
  opacity: 0.8; 
  cursor: pointer; 
  border-radius: 50%;
}

.icolumn img:hover {
  opacity: 1;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* The expanding image container */
.icontainer {
  position: relative;
  display: none;
}

/* Expanding image text */
#imgtext {
  position: absolute;
  bottom: 15px;
  left: 15px;
  color: white;
  font-size: 20px;
}

/* Closable button inside the expanded image */
.closebtn {
  position: absolute;
  top: 10px;
  right: 15px;
  color: white;
  font-size: 35px;
  cursor: pointer;
}

.text-highlight {
  font-style: normal;
  border-radius: 1em 0 1em 0;
  text-shadow: 1px 1px 1px #fff;
  background-image: 
    linear-gradient(-100deg, 
      rgba(255,250,150,0.15),
      rgba(255,250,150,0.8) 100%, 
      rgba(255,250,150,0.25)
    );
}