.top-nav {
  background-color: #28a745;
  padding: 10px 20px;
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 1000;
  overflow-x: auto;
  white-space: nowrap;
}

.top-nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: space-around;
  white-space: nowrap;
}

.top-nav ul li {
  margin: 0;
  flex-shrink: 0;
}

.top-nav ul li a {
  color: white;
  text-decoration: none;
  padding: 10px 15px;
  display: block;
  font-weight: bold;
}

.top-nav ul li a:hover {
  background-color: #218838;
  border-radius: 5px;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.menu-toggle span {
  background-color: white;
  border-radius: 2px;
  display: block;
  height: 3px;
  margin: 5px 0;
  width: 25px;
}

@media (max-width: 768px) {
  .top-nav ul {
    flex-direction: column;
    align-items: center;
    display: none;
    width: 100%;
  }

  .top-nav ul.showing {
    display: flex;
  }

  .top-nav ul li {
    width: 100%;
    text-align: center;
  }

  .menu-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .top-nav {
    overflow-x: auto;
  }

  .top-nav ul {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .top-nav ul li {
    flex-shrink: 0;
    white-space: nowrap;
  }
}