* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;

    --footer-height: 3rem;
    --calendar-header-height: 4rem;
}

body {
    background: #000;
}

footer {
    height: var(--footer-height);
    background: rgba(0, 0, 0, 0.4);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
}

footer a {
    color: #76d714;
    text-decoration: none;
}

footer a:hover {
    color: #609926;
}

.container {
    width: 100%;
    height: calc(100vh - var(--footer-height));
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 0 1 auto;
    border-radius: .4rem;
}

#calendar {
    width: 1080px;
    height: 910px;

    /* From https://css.glass */
    background: rgba(62, 31, 31, 0.2);
    border-radius: .4rem;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* ===== HEADER ===== */
#calendar__header {
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    display: flex;
    justify-content: space-between;
    height: var(--calendar-header-height);
    border-radius: .4rem .4rem 0 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

#calendar__header * {
    width: 7rem;
    height: 100%;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    font-size: 1.2rem;
    font-weight: bold;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
}

#calendar__header .year {
    justify-content: start;
}

#calendar__header .month {
    justify-content: end;
}

#calendar__header .actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

#calendar__header .actions button {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;

    background: none;
    color: white;
    border: none;
    border-radius: 5px;
}

/* ===== BODY ===== */
#calendar__body {
    width: 100%;
    height: calc(100% - var(--calendar-header-height));
    padding: 1rem;
    border-radius: 10px;

    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr 1fr 1fr;
    grid-template-rows: auto 1fr 1fr 1fr 1fr 1fr 1fr;
    gap: 0.5rem 0.5rem;
    grid-template-areas:
    ". . . . . . ."
    ". . . . . . ."
    ". . . . . . ."
    ". . . . . . ."
    ". . . . . . ."
    ". . . . . . ."
    ". . . . . . .";
}

#calendar__body .day {
    background: rgba(255, 255, 255, 0.7);
    border-radius: 0.2rem;
    cursor: pointer;
}

#calendar__body .dim {
    background: rgba(192, 192, 192, 0.7);
}

#calendar__body .weekday {
    height: 2.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    user-select: none;
    cursor: initial;
    text-transform: uppercase;
}

#calendar__body .monthday {
    display: flex;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

#calendar__body .monthday #date {
    margin-top: .3rem;
    margin-left: .5rem;
}