main {
  background-color: #eee;
}

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

header, footer {
  background: #333;
  color: white;
  text-align: center;
  padding: 10px;
}

.nav-list {
  list-style: none;
  display: flex;
  background: #eee;
  padding: 0;
}

.nav-list li {
  margin: 10px;
}

.nav-list a {
  text-decoration: none;
  padding: 5px;
}

.nav-list a:hover {
  background: #ddd;
}

.float-box {
  float: left;
  width: 200px;
  margin-right: 20px;
}

.clearfix {
  clear: both;
}

table {
  border-collapse: collapse;
  width: 100%;
}

td, th {
  border: 1px solid black;
  padding: 8px;
}

button {
  padding: 8px 12px;
  border: 1px solid black;
  background-color: white;
  cursor: pointer;
}

button:hover {
  background-color: #ddd;
}

/* for images */
.grid {
  display: flex;
  gap: 20px;
}

img {
  width: 150px;
}

/* nav layout changes for smaller screens */
@media (max-width: 768px) {
  .nav-list {
    flex-direction: column;
  }

  .grid {
    flex-direction: column;
  }
}