tabloid-fake-closure/static/css/main.css

html {
    --ff-mono: 'IBM Plex Mono', monospace;
    --ff-sans: 'IBM Plex Sans', sans-serif;
    --ff-tabloid: 'Alfa Slab One', sans-serif;
    font-size: 18px;
}

/* resets */

html,
body {
    --block-accent-color: #e02345;
    margin: 0;
    background: #f8f5f5;
}

main {
    width: calc(100% - 1.5em);
    max-width: 840px;
    margin: 1em auto;
    font-family: var(--ff-sans);
}

h1,
h2,
h3 {
    font-family: var(--ff-tabloid);
    font-weight: normal;
    color: var(--block-accent-color);
    margin: .5rem 0;
}

p {
    margin-top: .5em;
    margin-bottom: 1em;
}

button {
    font-size: 1em;
}

code,
input,
textarea {
    font-family: var(--ff-mono);
}

/* layout */

header,
footer {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 3em;
}

nav {
    margin: .8em 0;
}

nav a {
    color: var(--block-accent-color);
    margin: 0 1em;
}

header .subtitle {
    font-size: 1.2em;
}

header .lang.block {
    --block-background-color: #000;

    font-size: 1.4em;
    font-family: var(--ff-tabloid);
    font-weight: normal;
    color: #fff;
    display: inline-block; /* for transforms */
    transform: rotate(-10deg);
    pointer-events: none;
}

.editor {
    display: flex;
    flex-direction: column;
    position: relative;
    margin-bottom: 3em;
}

.editor .code,
.editor .output,
.editor .errors {
    width: 100%;
    padding: .5em 1em;
    border-bottom: 3px solid var(--block-text-color);
    box-sizing: border-box;
}

.editor > :last-child {
    border-bottom: 0;
}

.editor.block {
    padding: 0;
}

.editor .controls {
    position: absolute;
    top: -24px;
    right: 0;
    width: 100%;
    box-sizing: border-box;
    padding: 0 1em;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
}

.editor .output {
    min-height: 5em;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.5em;
}

.editor .output .output-line {
    width: 100%;
}

.editor .code {
    padding: 0;
    position: relative;
}

.editor .errors {
    color: var(--block-accent-color);
}

.filler,
textarea.editor-input {
    font-family: var(--ff-mono);
    font-size: 1em;
    line-height: 1.3em;
    padding: .5em 1em;
    border: 0;
    width: 100%;
    box-sizing: border-box;
    overflow-y: auto;
    resize: none;
    white-space: nowrap;
}

textarea.editor-input {
    position: absolute;
    background: var(--block-background-color);
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

textarea.editor-input:focus {
    outline: none;
    background: #f8f8f8;
}

.filler p {
    margin: 0;
    padding: 0;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.output .no-output {
    color: #777;
}

footer a {
    color: var(--block-accent-color);
}