@media screen and (max-width:450px) {
    #centerDiv {
        width:90% !important;
    }

    #btnContact {
        width: 95%;
        background: transparent;
        border-radius: 50px;
        border-color: white;
        color: white;
        padding: 10px;
        text-align: center;
        text-decoration: none;
        display: inline-block;
        font-size: 12px;
    }
}

@media screen and (max-width:320px) {
    #centerDiv {
        width: 90% !important;
        font-size:10px !important;
    }

    h2 {
        font-size: 15px !important;
    }

    #btnContact {
        width: 95%;
        background: transparent;
        border-radius: 50px;
        border-color: white;
        color: white;
        padding: 10px;
        text-align: center;
        text-decoration: none;
        display: inline-block;
        font-size: 12px;
    }
}