#terminal-container {
    width: 80%; /* or any width you want */
    height: calc(80% / 2.92); /* maintain 160:40 chars with aspect ratio 2.5 */
    margin: 1em 10%;
    max-height: 80vh; /* prevent growing too tall on tall screens */
    display: flex;
    flex-direction: column;
    background: black;
    overflow: hidden; /* prevent scroll */
    box-sizing: border-box;
    border: 1px solid #444;
}

#terminal {
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
    display: block;
    background: black;
}