.form-inline .form-fields {
    display: flex;
    justify-content: flex-start;
    margin-left: 0 !important;
    margin-right: 0 !important;
}

.form-inline .form-fields > div:nth-child(1){
    flex: 1;
}

.form-inline .form-fields > div:nth-child(1) > div {
    width: 100%;
}

.form-inline .form-fields > div:nth-child(1) > div > * {
    width: 100%;
}