style.css

@font-face {
    font-family: commodore_pro;
    src: url(C64_Pro_Mono-STYLE.ttf);
}

:root {
    --fg-color: #867ADE;
    --bg-color: #483AAA;
    --br-color: #867ADE;
}

* {
    font-family: commodore_pro;
    font-size: 1em;
    color: var(--fg-color)
}

body {
    background-color: var(--br-color);
    margin: 0;
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

main {
    background-color: var(--bg-color);
    margin: auto;
    height: 40em;
    width: 64em;
}

#input {
    position: absolute;
    background-color: transparent;
    caret-color: transparent;
    padding: 0;
    border: none;
    width: 64em;
}

#input:focus {
    outline: none;
}

#input::selection {
    background-color: var(--fg-color);
    color: var(--bg-color);
}

#caret {
    position: absolute;
    animation: blink 700ms infinite;
    pointer-events: none;
}

@keyframes blink {
    0%, 49% { opacity: 100%; }
    50%, 100% { opacity: 0%; }
}

#file {
    display: none;
}

span {
    white-space: pre;
}