html {
    height: 100%;
}
body {
    margin: 0;
    height: 100%;
    /* Subtract padding when calculating height of element to prevent
     * scrollbars. */
    box-sizing: border-box;

    display: grid;
    justify-content: center; /* center left/right */
    grid-template-rows: auto 1fr auto;

    background-color: #e8e8e8; /* light gray */
}

header {
    display: flex;
    align-items: center;
    gap: 1.5em;
    padding: 1em;
}

main {
    margin: 3em;
    display: grid;
    justify-content: center;
}
.error {
    padding: 1em;
}
form {
    padding: 1.3em 2em 1.3em 2em;
    background-color: white;
    border-radius: 2em;
}
input {
    margin: 0.3em;
}

footer {
    display: flex;
    justify-content: center;
    gap: 0.6em;
    flex-wrap: wrap;
    margin: 1em;
}
footer a {
    color: #0000c1; /* darker blue */
}
footer img {
    height: 20px;
    padding-right: 0.5em;
}