body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 20px;
    line-height: 1.5;
    color: white;
    background-color: #333;
    margin: 0;
    padding: 15px;
    text-align: center;
}
input, button {
    font-size: 16px;
    padding: 8px;
    border-radius: 8px;
    border-width: 0;
}
button {
    background-color: #0074d9;
    color: white;
    cursor: pointer;
}
label {
    color: #282828;
    font-style: italic;
}
.output {
    background-image: linear-gradient(to bottom, #888, #666);
    padding: 10px;
    margin: 15px auto;
    border-radius: 15px;
    width: 500px;
    box-shadow: 0px 5px 10px #0005;
}
.output div {
    background-color: #333;
    border-radius: 5px;
}
#letter-output, #rna-output {
    font-family: monospace;
}