:root {
    --background-color: #1e1e1e;
    --background-image: "";

    --card-blur: 10px;
    --card-brightness: 50%;
    --card-saturation: 50%;
    --card-background: rgba(0, 0, 0, 0.15);
    --card-border-radius: 1rem;

    --shadow-offset-x: 0px;
    --shadow-offset-y: 0px;
    --shadow-blur-radius: 10px;
    --shadow-spread-radius: 0px;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
}

main {
    display: flex;
    justify-content: center;
    height: 100vh;
    width: 100%;
    background-image: var(--background-image);
    background-size: cover;
    background-position: center;
    color: white;
}

main::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--background-color);
    z-index: 1;
}

.card {
    backdrop-filter: blur(var(--card-blur)) brightness(var(--card-brightness)) saturate(var(--card-saturation));
    border-radius: var(--card-border-radius);
    box-shadow: var(--shadow-offset-x) var(--shadow-offset-y) var(--shadow-blur) var(--shadow-spread) var(--shadow-color);
    background-color: var(--card-background);
    z-index: 2;
}

#header {
    width: 100%;
    height: 5rem;
    margin: 3rem;
    padding-inline: 1.5rem;
}