:root {
    --header-font-size: 30px;
    --primary-font-size: 20px;
    --header-height: 5em;
    --logout-form-size: 25px;
    --standard-box-shadow: 0px 0px 15px 5px rgba(0, 0, 0, 0.75);
    --book-title-height: 50px;
    --b-width: 225px;
    --b-height: calc(calc(var(--b-width) * calc(1.4 / 1)) + var(--book-title-height));
    --paper-color: #FCF6F0;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

body {
    font-size: var(--primary-font-size);
    background-color: #613120;
}

input {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

span.btn {
    cursor: pointer;
}

div.container {
    width: 100%;
    display: grid;
    min-height: 100vh;
    grid-template-areas: "content" "footer";
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
    background-image: url(../images/wood-back.png);
    background-size: auto;
    background-position: center;
    background-attachment: fixed;
}

div.wrapper {
    grid-area: content;
}

.index-header,
.listing-header {
    grid-area: header;
    display: grid;
    place-items: center;
    background-color: rgba(0, 0, 0, 0.5);
    font-size: var(--header-font-size);
    color: #fff;
}

div.footer {
    grid-area: footer;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.5);
    color: #fff;
    user-select: none;
    flex-shrink: 0;
}

.logout_form {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    align-items: flex-end;
}

.logout_form>button {
    background-color: transparent;
    border: none;
    color: blue;
    text-decoration: underline;
    text-shadow: 0px 0px 7px white;
}

.logout_form>button:hover {
    cursor: pointer;
    transform: scale(1.1);
    transform-origin: right;
}