@media (max-width: 768px) {

  nav {
    flex-direction: column;
    text-align: center;
    padding: 10px 0;
    position: static;
  }

  .left {
    margin-left: 0;
    margin-bottom: 20px;
    font-size: 1.3rem;
  }

  .right ul {
    margin-left: 0;
  }
  li {
    padding-left: 5px;
    font-size: 0.8rem;
}

  .first {
    padding-top: 100px;
  }

  .left_sec {
    font-size: 1.2rem;
    margin-left: 0;
    line-height: 25px;
    width: 60%;
    margin: 1rem;
    text-align: center;
  }

  .right_sec {
    width: 35%;
  } 

  .right_sec img {
    margin-top: 20px;
    width: 120px;
    height: 120px;
  }

  .title {
    font-size: 2rem;
    margin: 20px;
    text-align: center;
  }

  p {
    margin: 0 1rem;
    font-size: 1rem;
  }

  .container {
    flex-direction: column;
    align-items: center;
  }

  .container .pro {
    height: auto;
    width: 70%;
  }

  .img1,.img2,.img3 {
    height: 150px;
    width: 95%;
    margin: 8px 5px 20px 10px;
  }

  form {
    width: 60%;
    margin: 50px auto 100px auto;
  }

  form button {
     padding: 0.75rem 7rem 0.75rem 7rem ;
  }

  footer p {
    font-size: 0.9rem;
  }
}