.div-header {
  position: relative;
  width: 100%;
  height: 230px;
  background: url("./assets/Banner.jpg") no-repeat;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Roboto", sans-serif;
}

.div-header::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.7),
    rgba(0, 0, 0, 0.3)
  );
  z-index: 1;
}

header {
  z-index: 2;
}

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

nav ul li {
  margin: 0 15px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-size: 18px;
  transition: color 0.3s ease;
}

nav ul li a:hover {
  color: #0077ff;
}

nav ul li img {
  height: 60px;
  margin-top: -25px;
  vertical-align: middle;
}

@media screen and (max-width: 768px) {
  .div-header {
    height: 200px;
  }

  nav ul {
    flex-direction: column;
    align-items: center;
  }

  nav ul li {
    margin: 10px 0;
  }

  nav ul li img {
    height: 50px;
  }
}