#calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-template-rows: repeat(6, 1fr);
    grid-gap: 2px;
}

.day {
    border: 1px thin black;
    text-align: center;
    padding: 10px;
}

.green {
    background-color: lightgreen;
}

.red {
    background-color: lightcoral;
}

.half-green-half-red {
    background: linear-gradient(to bottom right, lightgreen 50%, lightcoral 50%);
}

.half-red-half-green {
    background: linear-gradient(to bottom right, lightcoral 50%, lightgreen 50%);
}

.title {
    text-align: center;
}