FeDirect/static/crossroad.css

:root {
    --red: #cb0b0b;
    --blue: #2081c3;
    --large: 2em;
    --medium: 1em;
}

html,
body {
    background: linear-gradient(300deg, var(--red), var(--blue));
    background-size: 100vw 100vh;
    margin: 0;
    min-height: 100vh;
    height: 100vh;
    font-family: sans-serif;
}

dialog {
    background-color: white;
    border: 0;
    border-radius: var(--large);
    opacity: 0;
    transition: opacity 0.125s ease-out;
}

dialog::backdrop {
    backdrop-filter: blur(5px);
    background-color: #0008;
    transition: background-color 0.125s ease-out;

    @starting-style {
        /* This might not work on Firefox because Firefox being behind moment */
        background-color: #0000;
    }
}

dialog[open] {
    opacity: 1;

    @starting-style {
        /* This might not work on Firefox because Firefox being behind moment */
        opacity: 0;
    }
}

header {
    display: flex;
    justify-content: space-between;
}

abbr[title] {
    text-decoration-color: var(--blue);
}

.flex-vcenter {
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.flex-row {
    display: flex;
    flex-direction: row;
}

.half-width {
    min-width: 50%;
}

.half-height {
    min-height: 50%;
}

.separator-bottom {
    border-bottom: solid 1px #0008;
}

.margin-auto-top {
    margin-top: auto;
}

.margin-large-bottom {
    margin-bottom: var(--large);
}