body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #007bff;
}

.input-block {
    margin-bottom: 20px;
}

.input-block label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.input-block input {
    width: calc(33.33% - 10px);
    padding: 10px;
    border: 1px solid #cccccc;
    border-radius: 4px;
    margin-right: 10px;
    box-sizing: border-box;
}

.input-block input:last-child {
    margin-right: 0;
}

button {
    display: block;
    margin: 0 auto;
    padding: 10px 20px;
    background-color: #007bff;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

#result {
    margin-top: 20px;
    font-weight: bold;
}