.primaryContainer {
    height: auto;
    margin-left: auto;
    margin-right: auto;
    min-height: 100%;
    width: 100%;
}

#caculator {
    float: none;
    height: auto;
    margin-left: auto;
    margin-top: 25px;
    clear: none;
    width: 500px;
    margin-right: auto;
}

#box {
    float: none;
    height: 100px;
    margin-left: auto;
    margin-top: 0px;
    clear: none;
    width: 100%;
    margin-right: auto;
}

@media only screen and (max-width: 500px) {
    #caculator {
        width: 90%;
    }
}