* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: #f3f6f8;
    font-family: Arial, sans-serif;
}

.card {
    width: min(620px, calc(100% - 32px));
    padding: 32px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.12);
}

h1 {
    margin-top: 0;
}

.result {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 14px 0;
    border-bottom: 1px solid #ddd;
}

button {
    margin-top: 24px;
    padding: 12px 18px;
    cursor: pointer;
}