html {
    font-family: Arial;
    background-color: #e0e0e0;
    line-height: 1.4;
}

body {
    margin-left: 20px;
    margin-right: 20px;
}

h1 {
    text-align: center;
}

h2 {
    margin: 0;
    padding: 0;
}

h4 {
    margin-top: 40px;
}

.container {
    background-color: #FFFFFF;
    margin: 0 auto;
    border: 1px solid #818181;
    padding: 20px;
    max-width: 400px;
}

.responsive {
    max-width: 100%;
}

.subtitle {
    margin-top: 40px;
    font-weight: 700;
    font-size: 24px;
}

.mailing-list {
    border: 1px solid #818181;
    padding: 20px;
}

.form-field {
    font-size: 18px;
    padding: 5px;
}

.form-submit {
    margin-top: 8px;
    font-size: 18px;
    padding: 5px 8px 5px 8px;
}