@media (min-width: 481px) {
  header,
  header a,
  header a img,
  header nav,
  header nav ul,
  header nav ul li,
  header nav ul li a,
  header a button {
    background-color: #24252a;
  }

  .logo-ib {
    width: 100px;
  }

  header li,
  header a,
  header button {
    font-weight: 500;
    font-size: 16px;
    color: #e7e7e7;
    text-decoration: none;
  }

  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 10%;
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1000;
  }

  .logo-ib {
    cursor: pointer;
  }

  .menu-items {
    list-style: none;
  }

  .menu-items li {
    display: inline-block;
    padding: 0px 20px;
  }

  .menu-items li a {
    transition: 0.3s;
  }

  .menu-items li a:hover {
    transition: 0.3s;
    color: #0088a9;
  }

  .header-main {
    padding: 9px 25px;
    background-color: rgb(1, 121, 151);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease 0s;
    font-family: "Montserrat", sans-serif;
  }

  .header-main {
    background-color: rgba(0, 136, 169, 0.7);
  }

  header a button:hover {
    opacity: 0.7;
  }
}
@media (max-width: 480px) {
  header,
  header a,
  header a img,
  header nav,
  header nav ul,
  header nav ul li,
  header nav ul li a,
  header a button {
    background-color: #24252a;
  }

  .logo-ib {
    width: 60px;
  }

  header ul {
    font-size: 5px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    row-gap: 10px;
    column-gap: 15px;
    margin: 0px 20px;
  }

  header li,
  header a,
  header button {
    font-weight: 500;
    font-size: 8px;
    color: #e7e7e7;
    text-decoration: none;
  }

  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 8px;
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1000;
  }

  .logo-ib {
    cursor: pointer;
  }

  .menu-items {
    list-style: none;
  }

  .menu-items li {
    display: inline-block;
  }

  .menu-items li a {
    transition: 0.3s;
  }

  .menu-items li a:hover {
    transition: 0.3s;
    color: #0088a9;
  }

  .header-main {
    padding: 9px 10px;
    background-color: rgb(1, 121, 151);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease 0s;
    font-family: "Montserrat", sans-serif;
  }

  .header-main {
    background-color: rgba(0, 136, 169, 0.7);
  }

  header a button:hover {
    opacity: 0.7;
  }
}