.header-banner{
    max-width: 1800px;
    margin: auto;
    height: 500px;
    padding-top: 350px;
    background: linear-gradient(to top, rgba(1, 58, 37, 0.598), rgba(1, 61, 53, 0), rgba(0, 0, 0, 0.024)), url(../image/Certificate\ banner.webp);
    background-position: center;
    background-size: 100% 120%;
    text-align: center;
    margin-top: -80px;
  }
 
  
.header-banner h1{
    font-weight: 800;
    color: white;
}

.sec1a{
    max-width: 1800px;
    margin: auto;
    padding: 50px 4%;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.sec1a  img{
    width: 48%;
    margin-bottom: 50px;
    border: 10px solid black;
}


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

        .header-banner{
            height: 450px;
        }
        .header-banner h1{
            font-weight: 600;
        }

        .container .box{
            width: 100%;
        }
     
  
        .sec1a  img{
            width: 100%;
        }

  }