body {
    margin: 0;
    height: 100vh;
    background-image: linear-gradient(to bottom, #eee, #ccc);
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 32em;
    height: 38em;
    font-size: 14px;
    --main-color: sandybrown;
    background-image: linear-gradient(to bottom, var(--main-color) 50%, white 50%);
    border-radius: 1em;
    box-shadow: 
        0 2px 1px rgba(0, 0, 0, 0.2),
        0 3px 1px white;
    position: relative;
    font-family: sans-serif;
    user-select: none;
}

.container::before,
.container::after {
    content: '';
    position: absolute;
    width: 0.6em;
    height: 2.3em;
    background-color: white;
    top: calc(50% - 2.3em / 2);
    border-radius: 0.3em;
    box-shadow: 
        0 3px 1px rgba(0, 0, 0, 0.3),
        0 -1px 1px rgba(0, 0, 0, 0.2);
}

.container::before {left: 2em;}
.container::after {right: 2em;}

.today {
    height: 50%;
    padding: 3em;
    box-sizing: border-box;
    color: white;
}

.today .day {
    font-size: 8em;
    line-height: 1em;
    font-weight: bold;
}

.today .month {
    font-size: 4em;
    line-height: 1em;
    text-transform: lowercase;
}

.calendar {
    padding-top: 3.5em;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.calendar .days,
.calendar .dates {
    width: 28em;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    line-height: 2em;
    text-align: center;
}

.calendar .days {
    color: var(--main-color);
    font-weight: bold;
    text-transform: uppercase;
}

.calendar .dates {
    color: dimgray;
}

.calendar .dates .previous-month,
.calendar .dates .next-month {
    color: lightgray;
}

.calendar .dates .current-day {
    color: var(--main-color);
    font-weight: bold;
}

.calendar .dates span:hover {
    background-color: lightgray;
    color: white;
}

.calendar .dates span {
    transition: 0.3s;
}