.form-adduser {
    max-width: 600px;
    padding: 10px;
    margin: 0 auto;
}

.form-adduser .form-control {
    position: relative;
    font-size: 16px;
    height: auto;
    padding: 10px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

#add-msg {
    height: 1em;
}