/**
 * 1. Make the dialog container, and its child overlay spread across
 *    the entire window.
 */
.dialog-container,
.dialog-overlay {
    position: fixed; /* 1 */
    top: 0; /* 1 */
    right: 0; /* 1 */
    bottom: 0; /* 1 */
    left: 0; /* 1 */
}

/**
  * 1. Make sure the dialog container and all its descendants sits on
  *    top of the rest of the page.
  * 2. Make the dialog container a flex container to easily center the
  *    dialog.
  */
.dialog-container {
    z-index: 20; /* 1 */
    display: flex; /* 2 */
}

/**
  * 1. Make sure the dialog container and all its descendants are not
  *    visible and not focusable when it is hidden.
  */
.dialog-container[aria-hidden='true'] {
    display: none; /* 1 */
}

/**
  * 1. Make the overlay look like an overlay.
  */
.dialog-overlay {
    background-color: rgb(0 0 0 / 0.9); /* 1 */
    animation: fade-in 200ms both;
}

/**
  * 1. Vertically and horizontally center the dialog in the page.
  * 2. Make sure the dialog sits on top of the overlay.
  * 3. Make sure the dialog has an opaque background.
  */
.dialog-content {
    margin: auto; /* 1 */
    z-index: 2; /* 2 */
    position: relative; /* 2 */
    background-color: white; /* 3 */

    animation: fade-in 400ms 200ms both, slide-up 400ms 200ms both;
    padding: 1em;
    max-width: 90%;
    width: 600px;
    border-radius: 5px;
}

@media screen and (min-width: 700px) {
    .dialog-content {
        padding: 2em;
    }
}

@keyframes fade-in {
    from {
        opacity: 0;
    }
}

@keyframes slide-up {
    from {
        transform: translateY(10%);
    }
}

@media (prefers-reduced-motion: reduce) {
    .dialog-overlay,
    .dialog-content {
        animation: none;
    }
}

.dialog-content h1 {
    margin: 0;
    font-size: 1.25em;
}

.dialog-close {
    position: absolute;
    top: 0.5em;
    right: 0.5em;
    border: 0;
    padding: 0.25em;
    background-color: transparent;
    font-size: 1.5em;
    width: 1.5em;
    height: 1.5em;
    text-align: center;
    cursor: pointer;
    transition: 0.15s;
    border-radius: 50%;
}

.dialog-close:hover {
    background-color: rgb(50 50 0 / 0.15);
}

@media screen and (min-width: 700px) {
    .dialog-close {
        top: 1em;
        right: 1em;
    }
}