* {
    box-sizing: border-box;
    margin: 0;
}

.week-counter {
    width: 2%;
    text-align: center;
    border-right: 1px lightgray solid;
    display: inline-block;
    font-size: 0.5rem;
}

.calendar-grid {
    font-size: 0;
    width: 100%;
}

.calendar-weekday-header {
    text-align: center;
    font-weight: bold;

    border-bottom: 1px black solid;
    font-size: 0.5rem;
}

.calendar-day {
    border-bottom: 1px lightgray solid;
    border-right: 1px lightgray solid;

    min-height: 100px;
    font-size: 0.5rem;
    height: 18vh;
}

.crossed-out {
    position: relative;
    overflow: hidden;
}

.crossed-out:before, .crossed-out:after {
    position: absolute;
    content: '';
    background: grey;
    display: block;
    width: 100%;
    height: 10px;
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
}

.crossed-out:after {
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}

.calendar-day.weekend-day {
    background: yellow;
}

.calendar-day .day-num {
    text-align: right;
    margin: 5px;
}

.day-num.today {
    background-color: red;
    color: white;
    padding-right: 4px;
    border-radius: 7px;
    margin: 5px 1px;
    font-weight: bold;
}

.event {
    background: pink;
    padding: 1px 5px;
    border-radius: 7px;
    margin: 5px;
}

.calendar-day,.calendar-weekday-header {
    width: 14%;
    display: inline-block;
}

.month-header {
    text-align: center;
}