common.css

:root {
    --text: hsl(30, 25%, 10%);
    --bg: hsl(30, 15%, 90%);
    --bold: hsl(30, 25%, 40%);
    --link: hsl(90, 70%, 30%);
    --highlight: hsl(30, 25%, 40%);
}

* {
    background: transparent;
    color: inherit;
    border: none;
    font-weight: inherit;
    font-size: inherit;
    font-style: inherit;
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    font: 16px/150% monospace;
    color: var(--text);
    margin: 0;
}

a {
    color: var(--link);
}

b {
    color: var(--bold);
}

@media (prefers-color-scheme: dark) {
    :root {
        --text: hsl(30, 15%, 90%);
        --bg: hsl(30, 25%, 10%);
        --bold: hsl(30, 25%, 70%);
        --link: hsl(90, 70%, 70%);
        --highlight: hsl(30, 25%, 70%);
    }
}

/* width */
::-webkit-scrollbar {
    width: 5px;
}

::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-corner {
    background: transparent;
}
::-webkit-scrollbar-track-piece {
    background: transparent;
}
/* Handle */
::-webkit-scrollbar-thumb {
    background: #777;
    border-radius: 4px;
    border: 1px solid transparent;
    background-clip: padding-box;
}

/* Handle on hover */
::-webkit-scrollbar-thumb:hover {
    background: #606060;
    border: 0;
}

#toast {
    visibility: hidden;
    min-width: 250px;
    margin-left: -125px;
    text-align: center;
    border-radius: 1em;
    padding: 8px;
    position: fixed;
    z-index: 1;
    left: 50%;
    bottom: 30px;

    color: hsl(30, 25%, 10%);
}

#toast.ok {
    background-color: hsl(90, 70%, 30%);
}

#toast.note {
    background-color: hsl(30, 25%, 55%);
}

#toast.error {
    background-color: hsl(0, 75%, 40%);
}

#toast.show {
    visibility: visible;
    animation: toast_fadein 0.5s, toast_fadeout 0.5s 2.5s;
}

@keyframes toast_fadein {
    from {bottom: 0; opacity: 0;}
    to {bottom: 30px; opacity: 1;}
}

@keyframes toast_fadeout {
    from {bottom: 30px; opacity: 1;}
    to {bottom: 0; opacity: 0;}
}