body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

.navbar {
  background-color: grey;
  overflow: hidden;
}

.navbar a {
  color: white;
  padding: 14px 20px;
  display: inline-block;
  text-decoration: none;
}

.navbar a:hover {
  background-color: #ddd;
  color: black;
}

.container {
  display: flex;
}

.column {
  padding: 20px;
}

.left {
  width: 20%;
  background-color: #f4f4f4;
}

.main {
  width: 60%;
}

.right {
  width: 20%;
  background-color: #f4f4f4;
}

.hover-img {
  width: 100%;
  opacity: 0.8;
  transition: opacity 1s;
}

.hover-img:hover {
  opacity: 1;
}

.popup-box {
  width: 200px;
  height: 100px;
  background-color: red;
  color: white;
  position: relative;
  z-index: 1;
  transition: all 0.3s ease;
}

.popup-box:hover {
  z-index: 10;
  background-color: pink;
}