#calculator_form{
    margin-bottom: 0px !important;
}

#calculator_result_block
{
    margin-top: 20px;
    text-align: center;
    border-style: solid;
    border-width: 3px;
    border-radius: 5px;
    border-color: inherit;
    padding: 10px;
}

#calculator_result_block,
#calculator_result_block * 
{
    font-size: 20px;
    font-weight: bold;
}