#main {
    float: left;
    width: 73%;
    display: block;
}

#main h1{
    margin-left:-20px;
     margin-top: 10px;
}

#main-core{
    margin-left: 10vw;
}

@media screen and (max-width: 1000px) {
    
    #main {
        float: left;
        width: 100%;
        display: block;
    }


    #main h1 {
        margin-left: 10px;
        margin-top: 10px;
    }

    #main-core {
        /* margin-left: 0vw; */
        margin-left: 20px;
        margin-right: 20px;
    }
}