* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  background: linear-gradient(90deg, rgba(144,224,224,1) 13%, rgba(186,147,186,1) 30%, rgba(101,236,171,1) 53%, rgba(0,212,255,1) 100%);
  font-family: Arial, Helvetica, sans-serif;
}

.navbar {
  background-color: lightgray;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
}

.logo {
  font-size: 22px;
  text-transform: uppercase;
  font-weight: bold;
}

.ul-list {
  list-style: none;
}

.nav-li {
  display: inline;
  margin-left: 30px;
}

.nav-li > a {
  font-size: 18px;
  text-decoration: none;
  font-weight: bold;
  color: black;
}

.nav-li > a:hover {
  color: blue;
  cursor: pointer;
}

.card {
  background-color: lightblue;
  padding: 15px;
  margin: 130px auto;
  width: 700px;
  border-radius: 10px;
  box-shadow: rgba(116,110,218,1) 0px 5px 15px;
  text-align: center;
}

h1 {
  font-size: 40px;
  margin-bottom: 10px;
}

.list-items {
  list-style-type: none;
  padding: 0;
  font-size: 20px;
}

.list-items > li {
  padding: 12px;
}

a {
  color: black;
  text-decoration: none;
}

a:hover {
  color: blue;
}

/* ===== Responsive Design ===== */

/* Medium devices (tablets, 768px and up) */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
  }

  .ul-list {
    padding-top: 10px;
    width: 100%;
  }

  .nav-li {
    display: block;
    margin: 10px 0;
  }

  .card {
    width: 90%;
    margin: 80px auto;
    padding: 20px;
  }

  h1 {
    font-size: 32px;
  }

  .list-items {
    font-size: 18px;
  }

  .list-items > li {
    padding: 10px 0;
  }
}

/* Small devices (phones, 480px and down) */
@media (max-width: 480px) {
  .logo {
    font-size: 18px;
  }

  .nav-li > a {
    font-size: 16px;
  }

  .card {
    margin-top: 60px;
    padding: 15px;
  }

  h1 {
    font-size: 26px;
  }

  .list-items {
    font-size: 16px;
  }

  a {
    font-size: 18px;
  }
}