@media only screen and (max-width: 1200px) {
  header {
    height: 65vh;
  }
}

@media only screen and (max-width: 1024px) {
  .row {
    margin: 0 15px;
  }

  .hero-text-box {
    width: 90%;
  }

  html {
    font-size: 57.5%;
  }

  .contact-section form {
    width: 100%;
    margin-left: 0;
  }
}

@media only screen and (max-width: 980px) {
  html {
    font-size: 62.5%;
  }

  .p-15 {
    padding-left: 0;
  }
  .client-photo {
    width: 100%;
    text-align: center;
    float: none;
  }
  .client-rivew {
    width: 100%;
    float: none;
    text-align: center;
  }
}

@media only screen and (max-width: 768px) {
  .main-nav {
    display: none;
  }

  .mobile-menu span {
    display: block;
  }
  .span_1_of_4 {
    width: 49.2%;
  }
  .span_1_of_4:nth-child(3) {
    margin-left: 0;
  }

  header {
    height: 50vh;
  }

  .little-description {
    width: 100%;
    margin-left: 0;
  }

  h1 {
    font-size: 3.5rem;
  }
  h2 {
    font-size: 3rem;
  }
  h3 {
    font-size: 2rem;
  }
  .portfolio-filter button {
    margin: 0.9rem 0;
  }
  .testimonial {
    width: 100%;
    text-align: center;
  }

  .testimonial .role,
  .testimonial h3 {
    padding-left: 7rem;
  }
  .testimonial .little-description {
    text-align: center;
    padding-left: 0;
  }
  .testimonial p {
    text-align: center;
    padding-left: 8rem;
  }

  .client-photo {
    width: 100%;
    text-align: center;
    float: none;
  }

  .contact-section form {
    margin-left: 0;
    width: 100%;
  }
}

@media only screen and (max-width: 480px) {
  header {
    height: 120vh;
  }

  .span_1_of_4 {
    width: 100%;
  }

  h1 {
    font-size: 2rem;
  }
  h2 {
    font-size: 2rem;
  }
  h3 {
    font-size: 2rem;
  }

  .testimonial .col:nth-child(3),
  .testimonial .col:nth-child(4) {
    margin-top: 4rem;
  }
}