body {
    background-color: #000;
    color: #33ff33;
    font-family: monospace;
    padding: 20px;
    margin: 0;
}
.terminal {
    max-width: 800px;
    margin: auto;
}
.line::before {
    content: "$ ";
}
#output {
    white-space: pre-wrap;
    margin-bottom: 1em;
}
input {
    background: transparent;
    border: none;
    color: #33ff33;
    font-family: monospace;
    font-size: 1em;
    width: 90%;
    outline: none;
}
a {
    color: #33ff33;
    text-decoration: underline;
}