body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background-color: #cb6ce6;
}

header {
  background-color: #592a5e;
  height: 120px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 30%;
}

.logo img {
  height: 120px;
}

nav ul {
  list-style: none;
  display: flex;
}

nav li {
  margin-left: 20px;
}

nav li:first-child {
  margin-left: 0;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: bold;
}

.left-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 20%;
  height: 150px;
  background-color: #cb6ce6;
  z-index: -1;
}

.right-bar {
  position: fixed;
  top: 0;
  right: 0;
  width: 20%;
  height: 150px;
  background-color: #cb6ce6;
  z-index: -1;
}

.main-content {
  width: 60%;
  margin: 0 auto;
}

.main-content img {
  width: 100%;
  height: auto;
  display: block;
}

@media only screen and (max-width: 768px) {
  nav ul {
    display: none;
  }

  .main-content {
    width: 80%;
  }

  .left-bar,
  .right-bar {
    display: none;
  }
}