btn {
    display: inline-block;
    padding: 12px 20px;
    margin-top: 20px;
    background-color: #006600;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
}

form {
    max-width: 900px;
    margin: 0 auto;
    font-family: Arial, sans-serif;
}

.ra-group, .rb-group {
    width: 45%;
    padding: 10px;
    background: #eef;
    margin: 10px;
    float: left;
    box-sizing: border-box;
    border-radius: 8px;
}

.rb-group {
    background: #efe;
}

.input-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.input-row label {
    flex: 1;
    margin-right: 10px;
}

.input-row input {
    flex: 1;
    padding: 5px;
}