#formwrapper {
    margin: auto;
    margin-top: 100px;
    width: 50%;
    min-width: 700px;
    max-width: 90%;
    border: 1px solid lightgrey;
    padding: 10px;
}

#formwrapper table, #formwrapper table tr{ 
    width: 100%;
}
#formwrapper input {
    width: 100%;
}