.header-banner{
    max-width: 1800px;
    margin: auto;
    height: 500px;
    padding-top: 350px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.968), rgba(3, 60, 122, 0), rgba(0, 0, 0, 0.889)), url(../image/mission\ &\ vision\ images.jpg);
    background-position: center;
    background-size: 100% 150%;
    text-align: center;
    color: rgb(255, 255, 255);
    margin-top: -80px;
  }
 
  .header-banner h1{
      font-weight: 800;
  }

  .gallery{
      max-width: 1800px;
      margin: auto;
      padding: 5% 3%;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-evenly;
  }
  .gallery img{
      width: 31%;
      margin-top: 30px;
  }


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

        .header-banner{
            padding-top: 300px;
            height: 400px;
        }
        .header-banner h1{
            font-size: 35px;
            font-weight: 600;
        }


        .sec2{
            padding-top: 20px;
        }
        .sec2-container{
            padding-top: 0;
            margin-top: 0;
        }
  
  }