.container {
    padding: 20px;
    font-family: system-ui, sans-serif
}

nav a {
    color: #0366d6;
    text-decoration: none
}

nav a:hover {
    text-decoration: underline
}

button {
    padding: 6px 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    background: #fff;
    cursor: pointer
}

button:disabled {
    opacity: .6;
    cursor: not-allowed
}

input {
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 6px
}