.container {
    width: 100%;
    max-width: 320px;
    box-sizing: border-box;
}

body {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

input {
    width: 100%;
    max-width: 220px;
    box-sizing: border-box;
}

button {
    margin-top: 10px;
}