.sec1 {
  max-width: 1800px;
  margin: auto;
  height: 500px;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.123), rgba(0, 0, 0, 0.103)), url(../image/Our\ Clients.jpg);
  background-position: center;
  background-size: 100% 180%;
  text-align: center;
  padding-top: 350px;
  color: white;
  font-size: 40px;
  margin-top: -80px;
}

.sec1 h1 {
  font-size: 55px;
  color: rgb(255, 255, 255);
  font-weight: 400;
}

.sec11-clients img {
  width: 150px;
  height: 80px;
  background-color: rgb(255, 255, 255);
}


@media screen and (max-width: 900px) {

  .sec1 {
    background-size: 140% 100%;
    height: 450px;

  }

  .sec1 h1 {
    font-size: 35px;
  }

  .bt {
    padding: 15px 0px;
  }

  .bt .btn-container button {
    margin: 0 10px;
  }

  .sec11 {
    padding: 10px;
    padding-bottom: 50px;
  }
  .sec11-boxes{
    width:100%;
  }
  .sec11-box {
    width: 150px;
    padding: 0;
    margin-top: 10px;
  }

}