@media screen and (min-width: 768px) {
  .intro-text {
    padding-top: 230px;
    padding-bottom: 250px;
  }
  header::after {
    margin-bottom: -20px;
  }
  .video .content p {
    text-align: center;
  }
  .grid-small-size .item h2 {
    font-size: 20px;
  }
}

@media (min-width: 768px) and (max-width: 991px) {
  .item h2 {
    font-size: 20px;
  }
  .img-search {
    width: 30px;
  }
  .author li {
    font-size: 10px;
  }
  .whatson-title {
    font-size: 20px;
  }
  .whatson-text, .readmore {
    font-size: 13px;
  }
}

/* tablet size */

@media screen and (max-width: 992px) {
  .grid-about {
    min-height: 100%;
    padding: 20px 0;
  }
  .advantages-head {
    font-size: 35px;
  }
  .advantages-desc {
    padding-bottom: 20px;
  }
  .middle {
    margin: 25px 0 0 0;
  }
  .explore-divide {
    margin-top: 30px;
  }
}

/* Mobile size */

@media screen and (max-width: 760px) {
  .nav {
    background-color: #fff;
    padding-top: 10px;
    padding-bottom: 10px;
    -webkit-box-shadow: 0px -3px 11px 1px rgba(0, 0, 0, 0.35);
    -moz-box-shadow: 0px -3px 11px 1px rgba(0, 0, 0, 0.35);
    -o-box-shadow: 0px -3px 11px 1px rgba(0, 0, 0, 0.35);
    box-shadow: 0px -3px 11px 1px rgba(0, 0, 0, 0.35);
    position: fixed;
  }
  .nav .mobile-brand {
    display: block;
    width: 135px;
    padding-top: 5px;
  }
  .nav-toggle {
    display: block;
    cursor: pointer;
  }
  .nav-toggle a, .nav .menu-item a {
    color: #757575;
    -webkit-transition: .1s all ease-in-out;
    -moz-transition: .1s all ease-in-out;
    -o-transition: .1s all ease-in-out;
    transition: .1s all ease-in-out;
  }
  .nav .menu-item a:hover {
    color: #42a5f5;
  }
  .nav-transparent .menu-item a:after, .nav-collapse .menu-item, .nav-collapse .brand, .nav-collapse.nav-responsive .brand-second, .nav .brand-second {
    display: none;
  }
  .nav-responsive {
    width: 100%;
    margin: 10px 0;
    padding: 10px 0;
    display: block;
    background: #fff;
    border-top: solid 1px #e0e0e0;
    -webkit-transition: margin .2s;
    -moz-transition: margin .2s;
    -o-transition: margin .2s;
    transition: margin .2s;
  }
  .nav-responsive .menu-item {
    text-align: left;
    display: block;
    line-height: 35px;
    margin: 0;
  }
  section .heading-title h1 {
    font-size: 37px;
  }
  .about-tabs li {
    padding: 2px 0;
  }
  .grid-about {
    padding: 5px 0;
  }
  .about .content p {
    text-align: justify;
  }
  .advantages-head {
    font-size: 32px;
    text-align: center;
  }
  .intro-text {
    padding-top: 150px;
    padding-bottom: 100px;
  }
  .intro-heading {
    font-size: 57px;
    line-height: 70px;
  }
  .video h1 {
    font-size: 35px;
  }
  .explore-divide h2 {
    text-align: center;
  }
  footer {
    text-align: center;
    padding-bottom: 20px;
  }
  .quicklinks {
    text-align: center;
  }
}