.seminarBlock{
    display: inline-block; 
    margin-left: 10%;
}

body img{
    max-width: 400px;
}
#acaImgDiv{
    display: block; 
    width: 90%;
}
#cloudarImgDiv{
    display: block; 
    width: 60%;
}

@media (max-width: 1100px) {
    body p{
        font-size: 13px;
    }
    body img{
        display: none;
    }
    .seminarBlock{
        margin-left: 10%;
    }
    #acaImgDiv{
        display: none;
    }
    #cloudarImgDiv{
        display: none;
    }

  }