body {
    max-width: 400px;
    margin: 60px auto;
    padding: 0 16px;
    background-color: whitesmoke;
}

h2 {
    text-align: center;
    font-size: 26px;
    color: black;
}

.input {
    margin-bottom: 16px;
}

label {
    display: block;
    margin-top: 16px;
    margin-bottom: 6px;
    font-size: 18px;
    font-weight: bold;
    color: black;
}

input {
    padding: 10px;
    margin-top: 4px;
    width: 100%;
    box-sizing: border-box;
    border: 3px solid black;
}

button {
    padding: 12px 18px;
    margin-top: 18px;
    margin-right: 8px;
    margin-bottom: 8px;
    cursor: pointer;
    background-color: lime;
    color: black;
    border: 3px solid black;
    font-size: 17px;
    font-weight: bold;
}

button:hover {
    background-color: lightgreen;
}

p {
    font-size: 22px;
    margin-top: 20px;
    font-weight: bold;
    padding: 12px;
    background-color: #bbbbbb;
    border: 3px solid black;
    color: black;
}

.countdown {
    background-color: #bbbbbb;
}

@media (max-width: 480px) {
    body {
        margin: 20px auto;
        padding: 0 12px;
    }

    h2 {
        font-size: 22px;
    }

    label {
        font-size: 16px;
    }

    input {
        font-size: 16px;
        padding: 12px;
    }

    button {
        font-size: 16px;
        padding: 14px;
    }

    p {
        font-size: 20px;
    }
}