div {
    display: flex;
    flex-direction: column;
}

div > div {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    margin-top: 5px;
    margin-bottom: 5px;
}

div > div > * {
    flex: 1;
    margin-left: 5px;
    margin-right: 5px;
}

button, select {
    cursor: pointer;
}