body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    background-color: #f8f8f8;
    width: 100%;
    text-align: center;
    padding: 20px 0;
}

section {
    max-width: 800px;
    min-width: 250px;
}

.selector {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px;
}

.selector label {
    margin: 0 5px;
    font-weight: bold;
}

.selector select {
    padding: 5px;
}

#swap-button {
    padding: 5px 10px;
    margin: 0 20px;
}

.results {
    margin: 20px;
}

.support-list {
    margin-top: 20px;
    display: none;
}

.support-list h2 {
    margin-bottom: 0;
}

#added-support h2 {
    color: green;
}

#removed-support h2 {
    color: red;
}

@media (max-width: 600px) {
    .selector {
        flex-direction: column;
        align-items: center;
    }
    .selector label,
    .selector select,
    #swap-button {
        margin-bottom: 10px;
    }
    .selector select {
        width: 100%;
    }
}