body {
  background: linear-gradient(
    142deg,
    rgba(2, 0, 36, 1) 0%,
    rgba(0, 212, 255, 1) 0%,
    rgba(4, 22, 71, 1) 92%,
    rgba(4, 4, 54, 1) 100%
  );
  margin: 0;
  font-family: Lato, Verdana, Arial, sans-serif;
  color: #fff;
  overflow-x: hidden;
  overflow-y: hidden;
}

header {
  background: #174db2;
  width: 100vw;
  height: 60px;
}

header img {
  margin-top: 3px;
  margin-right: 2vw;
  cursor: pointer;
}

header li {
  list-style: none;
  display: flex;
}

.notification {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  background-color: #4caf50;
  color: white;
  padding: 10px 20px;
  text-align: center;
  font-size: 18px;
  border-radius: 5px;
  display: none;
}

header li a {
  text-decoration: none;
  margin: 0.55vw 10px 10px 10px;
  color: #fff;
  border: 9px solid rgba(0, 0, 0, 0);
  border-radius: 10px;
  transition: 0.3s all;
}

header li a:hover {
  background: #58a2f1;
  transition: 0.3s all;
}