body {
    font-family: sans-serif;
    background: #F5F5F7;
}

#app {
    border: 1px solid #E5E5EA;
    border-radius: 0px;
    padding: 20px;
}

button {
    border-radius: 0px;
    background: #000;
    color: #fff;
    border: none;
    padding: 10px;
}